VXI VM2601, VM2602 User Manual

VM2601

80 MSa/S, 14-BIT DIGITIZER/IF RECEIVER

VM2602

40 MSa/S, 14-BIT DIGITIZER

VM2603

20 MSa/S, 14-BIT DIGITIZER

USER’S

ANUAL

M

P/N: 82-0063-000

Released September 14, 2006

VXI Technology, Inc.

2031 Main Street

Irvine, CA 92614-6509

(949) 955-1894

bus

VXI Technology, Inc.

2

www.vxitech.com

TABLE OF CONTENTS

INTRODUCTION

TABLE OF CONTENTS ................................................................................................................................................3

Certification ........................................................................................................................................................7

Warranty .............................................................................................................................................................7

Limitation of Warranty .......................................................................................................................................7

Restricted Rights Legend....................................................................................................................................7

DECLARATION OF CONFORMITY ...............................................................................................................................7

GENERAL SAFETY INSTRUCTIONS .............................................................................................................................8

Terms and Symbols ............................................................................................................................................8

Warnings.............................................................................................................................................................8

SUPPORT RESOURCES..............................................................................................................................................10

SECTION 1 ...................................................................................................................................................................11

INTRODUCTION .......................................................................................................................................................11

Overview...........................................................................................................................................................11

Data Acquisition ...............................................................................................................................................13

Programming and Data Access.........................................................................................................................13

Calibration ........................................................................................................................................................13

Front Panel Connectors.....................................................................................................................................14

SECTION 2 ...................................................................................................................................................................19

PREPARATION FOR USE ...........................................................................................................................................19

Installation ........................................................................................................................................................19

Calculating System Power and Cooling Requirements.....................................................................................19

Setting the Chassis Backplane Jumpers............................................................................................................20

Setting the Logical Address..............................................................................................................................20

SECTION 3 ...................................................................................................................................................................21

PROGRAMMING .......................................................................................................................................................21

Introduction.......................................................................................................................................................21

Notation ............................................................................................................................................................22

APPLICATION EXAMPLES ........................................................................................................................................23

SCPI Programming Example............................................................................................................................23

Register Access Example..................................................................................................................................24

VXIplug&play Driver Example........................................................................................................................26

SECTION 4 ...................................................................................................................................................................29

COMMAND DICTIONARY .........................................................................................................................................29

Introduction.......................................................................................................................................................29

Alphabetical Command Listing ........................................................................................................................29

Command Dictionary........................................................................................................................................37

COMMON SCPI COMMANDS ...................................................................................................................................38

*CLS.................................................................................................................................................................38

*ESE .................................................................................................................................................................39

*ESR? ...............................................................................................................................................................40

*IDN? ...............................................................................................................................................................41

*OPC.................................................................................................................................................................42

*RST.................................................................................................................................................................43

*SRE.................................................................................................................................................................44

*STB? ...............................................................................................................................................................45

VM2601/2/3 Preface 3

VXI Technology, Inc.

*TRG ................................................................................................................................................................46

*TST? ...............................................................................................................................................................47

*WAI ................................................................................................................................................................48

INSTRUMENT SPECIFIC SCPI COMMANDS ...............................................................................................................49

ABORt ..............................................................................................................................................................49

ARM:AUTO .....................................................................................................................................................50

ARM[:IMMediate]............................................................................................................................................51

ARM:LEVel......................................................................................................................................................52

ARM:SLOPe.....................................................................................................................................................53

ARM:SOURce..................................................................................................................................................54

CALCulate:FALL:TIMe...................................................................................................................................55

CALCulate:FREQuency? .................................................................................................................................56

CALCulate:NDUTy? ........................................................................................................................................57

CALCulate:NWIDth? .......................................................................................................................................58

CALCulate:PDUTy?.........................................................................................................................................59

CALCulate:PERCent:NOVershoot?.................................................................................................................60

CALCulate:PERCent:NPReshoot? ...................................................................................................................61

CALCulate:PERCent:NRINging? ....................................................................................................................62

CALCulate:PERCent:POVershoot?..................................................................................................................63

CALCulate:PERCent:PPReshoot?....................................................................................................................64

CALCulate:PERCent:PRINging? .....................................................................................................................65

CALCulate:PERiod?.........................................................................................................................................66

CALCulate:PWIDth?........................................................................................................................................67

CALCulate:RISE:TIMe? ..................................................................................................................................68

CALCulate:VOLTage:AMPLitude?.................................................................................................................69

CALCulate:VOLTage:HIGH?..........................................................................................................................70

CALCulate:VOLTage:LOW?...........................................................................................................................71

CALCulate:VOLTage:MAXimum? .................................................................................................................72

CALCulate:VOLTage:MEAN? ........................................................................................................................73

CALCulate:VOLTage:MINimum?...................................................................................................................74

CALCulate:VOLTage:NOVershoot?................................................................................................................75

CALCulate:VOLTage:NPReshoot?..................................................................................................................76

CALCulate:VOLTage:NRINging? ...................................................................................................................77

CALCulate:VOLTage:POVershoot? ................................................................................................................78

CALCulate:VOLTage:PPReshoot? ..................................................................................................................79

CALCulate:VOLTage:PRINging?....................................................................................................................80

CALCulate:VOLTage:PTPeak?........................................................................................................................81

CALCulate:VOLTage:RMS? ...........................................................................................................................82

CALibration:ADC:GAIN .................................................................................................................................83

CALibration:ADC:OFFSet...............................................................................................................................84

CALibration:COUNt?.......................................................................................................................................85

CALibration:DAC:GAIN .................................................................................................................................86

CALibration:DAC:OFFSet...............................................................................................................................87

CALibration:DEFault .......................................................................................................................................88

CALibration:RESet...........................................................................................................................................89

CALibration:SECure:CODE.............................................................................................................................90

CALibration:SECure[:STATe].........................................................................................................................91

CALibration:STORe.........................................................................................................................................92

COMBine:FEED...............................................................................................................................................93

CONFigure?......................................................................................................................................................94

CONFigure:ADC..............................................................................................................................................95

CONFigure:FALL:TIMe ..................................................................................................................................96

CONFigure:FREQuency...................................................................................................................................97

CONFigure:HORizontal:RESolution................................................................................................................98

CONFigure:NDUTy .........................................................................................................................................99

4 VM2601/2/3 Preface

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CONFigure:NWIDth ......................................................................................................................................100

CONFigure:PDUTy........................................................................................................................................101

CONFigure:PERCent:NOVershoot ................................................................................................................102

CONFigure:PERCent:NPReshoot ..................................................................................................................103

CONFigure:PERCent:NRINging....................................................................................................................104

CONFigure:PERCent:POVershoot.................................................................................................................105

CONFigure:PERCent:PPReshoot ...................................................................................................................106

CONFigure:PERCent:PRINging ....................................................................................................................107

CONFigure:PERiod........................................................................................................................................108

CONFigure:PWIDth .......................................................................................................................................109

CONFigure:RISE:TIMe..................................................................................................................................110

CONFigure:SAR:TIMe...................................................................................................................................111

CONFigure:SAR:TIMe?.................................................................................................................................112

CONFigure:VOLTage:AMPLitude ................................................................................................................113

CONFigure:VOLTage:HIGH .........................................................................................................................114

CONFigure:VOLTage:LOW ..........................................................................................................................115

CONFigure:VOLTage:MAXimum.................................................................................................................116

CONFigure:VOLTage:MEAN........................................................................................................................117

CONFigure:VOLTage:MINimum ..................................................................................................................118

CONFigure:VOLTage:NOVershoot...............................................................................................................119

CONFigure:VOLTage:NPReshoot.................................................................................................................120

CONFigure:VOLTage:NRINging ..................................................................................................................121

CONFigure:VOLTage:POVershoot................................................................................................................122

CONFigure:VOLTage:PPReshoot..................................................................................................................123

CONFigure:VOLTage:PRINging ...................................................................................................................124

CONFigure:VOLTage:PTPeak.......................................................................................................................125

CONFigure:VOLTage:RMS...........................................................................................................................126

CONTrol:IPOWer?.........................................................................................................................................127

FETCh?...........................................................................................................................................................128

INITiate:DELay..............................................................................................................................................129

INITiate[:IMMediate].....................................................................................................................................130

INPut:COUPling.............................................................................................................................................131

INPut:FILTer:FREQuency .............................................................................................................................132

INPut:FILTer:STATe .....................................................................................................................................133

INPut:IMPedance............................................................................................................................................134

INPut:OFFSet .................................................................................................................................................135

INPut:RANGe.................................................................................................................................................136

INPut:SOURce................................................................................................................................................137

MEASure:FALL:TIMe? .................................................................................................................................138

MEASure:FREQuency?..................................................................................................................................139

MEASure:NDUTy? ........................................................................................................................................140

MEASure:NWIDth? .......................................................................................................................................141

MEASure:PDUTy?.........................................................................................................................................142

MEASure:PERCent:NOVershoot? .................................................................................................................143

MEASure:PERCent:NPReshoot? ...................................................................................................................144

MEASure:PERCent:NRINging?.....................................................................................................................145

MEASure:PERCent:POVershoot?..................................................................................................................146

MEASure:PERCent:PPReshoot?....................................................................................................................147

MEASure:PERCent:PRINging? .....................................................................................................................148

MEASure:PERiod?.........................................................................................................................................149

MEASure:PWIDth?........................................................................................................................................150

MEASure:RISE:TIMe?...................................................................................................................................151

MEASure:VOLTage:AMPLitude?.................................................................................................................152

MEASure:VOLTage:HIGH? ..........................................................................................................................153

MEASure:VOLTage:LOW?...........................................................................................................................154

VM2601/2/3 Preface 5

VXI Technology, Inc.

MEASure:VOLTage:MAXimum?..................................................................................................................155

MEASure:VOLTage:MEAN? ........................................................................................................................156

MEASure:VOLTage:MINimum?...................................................................................................................157

MEASure:VOLTage:NOVershoot?................................................................................................................158

MEASure:VOLTage:NPReshoot?..................................................................................................................159

MEASure:VOLTage:NRINging? ...................................................................................................................160

MEASure:VOLTage:POVershoot? ................................................................................................................161

MEASure:VOLTage:PPReshoot?...................................................................................................................162

MEASure:VOLTage:PRINging?....................................................................................................................163

MEASure:VOLTage:PTPeak?........................................................................................................................164

MEASure:VOLTage:RMS?............................................................................................................................165

READ?............................................................................................................................................................166

ROSCillator:FREQuency................................................................................................................................167

ROSCillator:SOURce .....................................................................................................................................168

SAMPle:CLOCk:FREQuency ........................................................................................................................169

SAMPle:CLOCk:SOURce..............................................................................................................................170

SWEep:COUNt...............................................................................................................................................171

SWEep:POINts ...............................................................................................................................................172

SWEep:TINTerval..........................................................................................................................................173

SYNChronize:MODE.....................................................................................................................................174

SYNChronize:STATe.....................................................................................................................................175

TRIGger[:IMMediate] ....................................................................................................................................176

TRIGger:LEVel ..............................................................................................................................................177

TRIGger:SLOPe .............................................................................................................................................178

TRIGger:SOURce...........................................................................................................................................179

TRIGger:STATe? ...........................................................................................................................................180

REQUIRED SCPI COMMANDS................................................................................................................................181

STATus:OPERation:CONDition? ..................................................................................................................181

STATus:OPERation:ENABle.........................................................................................................................182

STATus:OPERation[:EVENt]? ......................................................................................................................183

STATus:PRESet .............................................................................................................................................184

STATus:QUEStionable:CONDition? .............................................................................................................185

STATus:QUEStionable:ENABle....................................................................................................................186

STATus:QUEStionable[:EVENt]? .................................................................................................................187

SYSTem:ERRor?............................................................................................................................................188

SYSTem:VERSion?........................................................................................................................................189

ERROR MESSAGES ................................................................................................................................................190

APPENDIX A ..............................................................................................................................................................193

NOISE SPECIFICATION ...........................................................................................................................................193

How RMS Noise is Calculated .......................................................................................................................193

INDEX ........................................................................................................................................................................195

6 VM2601/2/3 Preface

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CERTIFICATION

VXI Technology, Inc. certifies that this product met its published specifications at the time of shipment from the factory. VTI further certifies that its calibration measurements are traceable to the United States National Institute of Standards and Technology (formerly National Bureau of Standards), to the extent allowed by that organization’s calibration facility and to the calibration facilities of other International Standards Organization members.

WARRANTY

The product referred to herein is warranted against defects in material and workmanship for a period of three years from the receipt date of the product at customer’s facility. The sole and exclusive remedy for breach of any warranty concerning these goods shall be repair or replacement of defective parts or a refund of the purchase price, to be determined at the option of VTI.

For warranty service or repair, this product must be returned to a VXI Technology authorized service center. The product shall be shipped prepaid to VTI and VTI shall prepay all returns of the product to the buyer. However, the buyer shall pay all shipping charges, duties, and taxes for products returned to VTI from another country.

VTI warrants that its software and firmware designated by VTI for use with a product will execute its programming when properly installed on that product. VTI does not however warrant that the operation of the product or software or firmware will be uninterrupted or error free.

LIMITATION OF WARRANTY

The warranty shall not apply to defects resulting from improper or inadequate maintenance by the buyer, buyersupplied products or interfacing, unauthorized modification or misuse, operation outside the environmental specifications for the product or improper site preparation or maintenance.

VXI Technology, Inc. shall not be liable for injury to property other than the goods themselves. Other than the limited warranty stated above, VXI Technology, Inc. makes no other warranties, express, or implied, with respect to the quality of product beyond the description of the goods on the face of the contract. VTI specifically disclaims the implied warranties of merchantability and fitness for a particular purpose.

RESTRICTED RIGHTS LEGEND

Use, duplication or disclosure by the Government is subject to restrictions as set forth in subdivision (b)(3)(ii) of the Rights in Technical Data and Computer Software clause in DFARS 252.227-7013.

VXI Technology, Inc. 2031 Main Street Irvine, CA 92614-6509 U.S.A.

VM2601/2/3 Preface 7

www.vxitech.com

D ECLARATION OF C ONFORMITY

Declaration of Conformity According to ISO/IEC Guide 22 and EN 45014

ANUFACTURER’S NAME VXI Technology, Inc.

M

ANUFACTURER’S ADDRESS 2031 Main Street

M

Irvine, California 92614-6509

RODUCT NAME (VM2601) 80 MSa/s Digitizer & IF Receiver

P (VM2602) (VM2603) 20 MSa/s Digitizer

ODEL NUMBER(S) VM2601/VM2602/VM2603

M

RODUCT OPTIONS All

P

RODUCT CONFIGURATIONS All

P

VXI Technology, Inc. declares that the aforementioned product conforms to the requirements of the Low Voltage Directive 73/23/EEC and the EMC Directive 89/366/EEC (inclusive 93/68/EEC) and carries the “CE” mark accordingly. The product has been designed and manufactured according to the following specifications:

AFETY EN61010 (2001)

S

EMC EN61326 (1997 w/A1:98) Class A

CISPR 22 (1997) Class A VCCI (April 2000) Class A ICES-003 Class A (ANSI C63.4 1992) AS/NZS 3548 (w/A1 & A2:97) Class A FCC Part 15 Subpart B Class A EN 61010-1:2001

The product was installed into a C-size VXI mainframe chassis and tested in a typical configuration.

I hereby declare that the aforementioned product has been designed to be in compliance with the relevant sections of the specifications listed above as well as complying with all essential requirements of the Low Voltage Directive.

September 2006

40 MSa/s Digitizer

VM2601/2/3 Preface 7

Steve Mauga, QA Manager

Review the following safety precautions to avoid bodily injury and/or damage to the product. These precautions must be observed during all phases of operation or service of this product. Failure to comply with these precautions or with specific warnings elsewhere in this manual violates safety standards of design, manufacture, and intended use of the product.

Service should only be performed by qualified personnel.

TERMS AND SYMBOLS

These terms may appear in this manual:

WARNING

CAUTION

These symbols may appear on the product:

VXI Technology, Inc.

GENERAL SAFETY INSTRUCTIONS

Indicates that a procedure or condition may cause bodily injury or death.

Indicates that a procedure or condition could possibly cause damage to equipment or loss of data.

ATTENTION - Important safety instructions

WARNINGS

Frame or chassis ground

Indicates that the product was manufactured after August 13, 2005. This mark is placed in accordance with EN 50419, Marking of electrical and electronic equipment in accordance with Article 11(2) of Directive 2002/96/EC (WEEE). End-of-life product can be returned to VTI by obtaining an RMA number. Fees for take-back and recycling will apply if not prohibited by national law.

Follow these precautions to avoid injury or damage to the product:

Use Proper Power Cord

Use Proper Power Source

Use Proper Fuse

To avoid hazard, only use the power cord specified for this product.

To avoid electrical overload, electric shock or fire hazard, do not use a power source that applies other than the specified voltage.

To avoid fire hazard, only use the type and rating fuse specified for this product.

8 VM2601/2/3 Preface

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WARNINGS (CONT.)

Avoid Electric Shock

Ground the Product

Operating Conditions

Improper Use

To avoid electric shock or fire hazard, do not operate this product with the covers removed. Do not connect or disconnect any cable, probes, test leads, etc. while they are connected to a voltage source. Remove all power and unplug unit before performing any service.

Service should only be performed by qualified personnel.

This product is grounded through the grounding conductor of the power cord. To avoid electric shock, the grounding conductor must be connected to earth ground.

To avoid injury, electric shock or fire hazard:

- Do not operate in wet or damp conditions.

- Do not operate in an explosive atmosphere.

- Operate or store only in specified temperature range.

- Provide proper clearance for product ventilation to prevent overheating.

- DO NOT operate if any damage to this product is suspected.

Product should be inspected or serviced only by qualified personnel.

The operator of this instrument is advised that if the equipment is used in a manner not specified in this manual, the protection provided by the equipment may be impaired. Conformity is checked by inspection.

VM2601/2/3 Preface 9

VXI Technology, Inc.

SUPPORT RESOURCES

Support resources for this product are available on the Internet and at VXI Technology customer support centers.

VXI Technology World Headquarters

VXI Technology, Inc. 2031 Main Street Irvine, CA 92614-6509

Phone: (949) 955-1894 Fax: (949) 955-3041

VXI Technology Cleveland Instrument Division

VXI Technology, Inc. 7525 Granger Road, Unit 7 Valley View, OH 44125

Phone: (216) 447-8950 Fax: (216) 447-8951

VXI Technology Lake Stevens Instrument Division

VXI Technology, Inc. 1924 - 203 Bickford Snohomish, WA 98290

Phone: (425) 212-2285 Fax: (425) 212-2289

Technical Support

Phone: (949) 955-1894 Fax: (949) 955-3041 E-mail:

support@vxitech.com

http://www.vxitech.com for worldwide support sites and service plan information.

Visit

10 VM2601/2/3 Preface

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A

V

SECTION 1

INTRODUCTION

OVERVIEW

The VM2601, VM2602, and VM2603 (refered to as the VM260x) modules are high-resolution, high-speed digitizers. All three modules have Digital Storage Oscilloscope (DSO) functionality. In addition, the VM2601 also incorporates an Intermediate Frequency Receiver (IFR) function. This makes it ideal for applications in medical, automotive, semi-conductor, avionics, and communication test. The VM260x modules are a message-based device with a SCPI command set to simplify programming and configuration and register access to provide high-speed data throughput. Each module has either an 80 MSample/s (MSa/s) (VM2601), 40 MSa/s (VM2602), or 20 MSa/s (VM2603) ADC to support DSO applications. In addition, the DSO input can be routed to a 10 MSa/s ADC to support DC accurate low-frequency voltage measurements. A 16 MSa memory provides ample storage for even the most demanding test program. The DSO input features programmable impedance, ac, or dc coupling and a low-pass filter (LPF) with programmable corner frequencies.

This module is part of the VMIP™ family of instruments and can be combined with up to two other modules (e.g., 6.5 digit DMM, 50 MSa/s AWG, 1 ns counter/timer) to form a high-density VXIbus instrument. Three VM2601/2/3s can be installed in a single-wide C-size module providing three independent 80/40/20 MSa/s digitzer channels.

V X

I B U S

MIP

INTERFACE

F

IGURE 1-1: VMIP™ PLATFORM

M

MIP

INSTRUMENT

MODULE #1

I N T E R N

L

V

I P

B U S

MIP

INSTRUMENT

MODULE #2

VMIP

INSTRUMENT

MODULE #3

VM2601/2/3 Introduction 11

www.vxitech.com

NOTE With the exception of sample rate and IF receiver capabilities, all three VM260x modules perform

in the same manner. The VM2601 will be referenced thoughout the manual and, when exceptions exist, they will be noted.

DATA ACQUISITION

The input data is acquired when a conversion trigger event occurs from one of the four following methods:

1. Trigger source from the front panel input: This input has a ±4 V input range and may be programmed to trigger on either the rising or falling edge of this signal and at specified voltage levels with 12-bit resolution and accurate to 1% of full scale.

2. Trigger source from the VXI TTL trigger bus: Any one of the eight TTL trigger bus lines may be selected as the trigger source. The unit may be programmed to trigger on either the rising or falling edge of this signal.

3. Trigger upon receipt of a word serial command: When this mode is selected, the ADC will convert when a word-serial command is received by the instrument.

4. Trigger from the input channel: The input channel can be selected to trigger the board. It can be programmed to trigger during a rising or falling edge and may also trigger at specified voltage levels with 12-bit resolution and accurate to 1% of full scale.

Memory can be segmented such that sequential trigger events can be stored without forcing the device to rearm via software or waiting for the previous samples to be offloaded. Both pre-trigger and post-trigger samples can be acquired in up to eight segments. When the instrument is configured for greater than eight segments, only post-trigger samples will be stored. The device can support up to 65,536 segments. Since three VM2601 modules can be accommodated on a single C-size VXIbus card, three differential channels can all be operating and triggering independently. For example, one can be acquiring data while another is waiting for a trigger.

PROGRAMMING AND DATA ACCESS

As is true with most complex VXI Technology instrumentation, the VM2601give the user the ability to access the device using the VXI message-based interface as well as utilizing direct register access for fast data throughput. The SCPI (message based) command set is used for instrument configuration, measurement configuration, and to query the results of the measurements. Register access is used to transfer the raw digitizer data from the instrument to the host. With modern host computers and interfaces, all 16 MSa can be transferred in just a few seconds. Measurements are configured and initiated by SCPI commands from the host. Measurement data is output in response to a query from the host. This considerably reduces test program development and improves overall test times.

CALIBRATION

The calibration constants used to correct the data values are stored in non-volatile memory. These constants are determined when the instrument is calibrated and can be set or queried by word serial command. This eliminates the need for removing covers from the unit and allows for automated calibration.

VM2601/2/3 Introduction 13

FRONT PANEL CONNECTORS

+ INPUT (J111)

Positive differential input for DSO channel (channel A+)

VXI Technology, Inc.

ACC/ERR FAIL

J105

J106

J107

J108

J109

J110

ACC/ERR FAIL

J111

J112

J113

J114

J115

J116

ACC/ERR FAIL

J117

J118

J119

J120

J121

J122

- INPUT (J112)

Negative differential input for DSO channel (channel A-)

IF INPUT (J113)

Single-ended IFR input (channel B)

NOTE This connector is covered on the VM2602 and VM2603 modules.

TRIGGER/GP0 INPUT (J114)

External Trigger Input/GP0 marker input

ARM/GP1 INPUT (J115)

External Arm Input/GP1 marker input

EXTERNAL CLOCK INPUT (J116)

External Sample Clock

Note: Front panel J designators vary with the type(s) of module(s) installed and with the instrument’s position in the VMIP carrier.

FIGURE 1-2: FRONT PANEL LAYOUT

14 VM2601/2/3 Introduction

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TRIG

16 bit, 10 MHz

DDR

32/64 MB

VXI BUS

SYN C T RIG

IMMED

EXT

GLUE LOGIC

14 BITS

80 MHz

ADC

FAST

TO

DIFF

+

–

SINGLE

14 BITS

ADC

1 kHz ÷ 10 MHz

SLOW

TO

DIFF

+

–

SINGLE

INPUT

SYS_ CLK

ARM

16 bit, 10 MHz

VMIP

CARRIER

VXI BUS

SYN C

EXT

IMED

REF_LVL

TRIG_LVL

OFFS ET _L VL

EXT_C LK_LVL

EXT_AR M_LVL

EXT_TRIG_LVL

SYNC_OUT

SYS_ CLK_ OUT

SYNC_ARM_O UT

SYN C_TRIG_OUT

TTL_2_LVDSLVDS TTL_2_

DC_VERTICAL

+

–

1x, 2x, 4x

LPF 1

LPF 2

+

–

DIFF T O

SINGLE

÷ 1

÷ 10

+

–

2.5X

50 Ohm

IFR (only on the VM2601)

DSO_CHnI+

150 Ω

75 Ω

50 Ω

ADJ

REFERENCE

INPUT TRIG

ADJ

DAC

OFFSET

REF_LVL

DAC

+

–

OFFSET_LVL

DAC

EXT TRIG

÷ 1

TRIG_LVL

÷ 10

+

–

150 Ω

75 Ω

50 Ω

DSO_CHnl–

EXT_TRIG

EXT_TRIG_ LVL

EXT_AR M

+

–

DAC

EXT_ARM_ IN

EXT_ARM_ LVL

SYNC_OUT

SYNC_CLK_OUT

SYNC_ARM_O UT

SYN C_TRIG_OUT

EXT_C LK

+

–

DAC

EXT_CLK_IN

EXT_CLK_LVL

SYNC_INP

SYNC_CLK_INP

SYNC_ARM_INP

SYNC_TRIG_INP

SYNC_IN

SY NC_C LK_IN

SYNC_ARM_IN

SYNC_TRIG_IN

80 MHz INT

PPL

VXI _10 MHz

VM2601/2/3 Introduction 15

F

IGURE 1-3: VM260X BLOCK DIAGRAM

VXI Technology, Inc.

GENERAL

FEATURES

• Up to 80 MHz bandwidth for DSO (no filter) and 100 MHz for IFR (VM2601 only) – ideal for HF and IF frequencies

• Up to 80 MSa/s sample rate with pre and post trigger capability

• ±0.5 V, ±1.0 V, ±2 V, ±5.0 V, ±10.0 V, and ±20 V input ranges (DSO input)

• 50 , 75 , 150 , or 1 M input impedance, with ac or dc coupling (DSO input)

• Software selectable low-pass filter (DSO input)

• Built-in pulse parameter measurements

• Up to three independent channels per C-size card

• Auto re-arm capability for storing multiple waveforms with pre-trigger data

• Sleep mode reduces power consumption when not in use

• Dual channel synchronization for precise I/O

ANALOG INPUT

CHANNELS

DSO IFR (VM2601 only)

CONNECTORS

VM2601 VM2602/3

RESOLUTION

FULL-SCALE INPUT RANGES

DSO input IFR input

MAXIMUM SAMPLE RATE (SR

DSO input VM2601 VM2602 VM2603 IFR input (VM2601 only)

SAMPLE RATE RESOLUTION

BANDWIDTH

40 MHz, LPF On (VM2601) 20 MHz, LPF On (VM2601/2) 10 MHz, LPF On (VM2602/3) 5 MHz, LPF On (VM2603)

MEMORY

Standard (VM2601/2/3) Option (VM2601/2/3)

MEMORY SEGMENTS

With pre-trigger data Without pre-trigger data

SHARED MEMORY SPACE

IMPEDANCE

DSO input IFR input

INPUT COUPLING

DSO input IFR input

CAPACITANCE

1 Differential or Single-Ended (channels A+ and A-) 1 Single-Ended (channel B)

6 SMB Connectors 5 SMB Connectors

14 bits

±0.5 V, ±1.0 V and ±2.0 V; ±5.0 V, ±10 V, and ±20 V ±0.5 V

)

MAX

80 MSa/s 40 MSa/s 20 MSa/s 80 MSa/s

()

SR

MAX

, where n is an integer divider set by

n

40 MHz 20 MHz 10 MHz 5 MHz

16 MSa 32 MSa

8 segments 64k segments

A32

50 , 75 , 150 , or 1 MΩ 50 Ω

ac/dc dc

40 pF maximum

∗

SAMPle:CLOCk:FREQuency

∗

Note that the input voltage should not exceed 8 V dc or 8 V rms when the 50 Ω, 75 Ω, or 150 Ω input impedance is selected.

16 VM2601/2/3 Introduction

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ANALOG INPUT (CONTINUED)

COMMON MODE REJECTION RATIO (CMRR)

/2

 60 dB  30 dB

DC to 20 kHz @ ±0.5 V input range All other input ranges up to SR

MAX

OVERVOLTAGE PROTECTION

Low ranges High ranges

±5 V dc maximum ±50 V dc maximum

OFFSET ADJUSTMENT

±50% of full scale

DC ACCURACY

DSO FAST* DSO SLOW* IF (VM2601 only)

±1% of range ±0.5% of input, ±0.1% of range ±1% of range *50 Ω/75 Ω/150 Ω/1 MΩ impedance

AC AMPLITUDE ACCURACY

< 1 MHz 1 MHz to 20 MHz 20 MHz to 40 MHz

±0.1 dB ±0.5 dB ±2.5 dB

FREQUENCY FLATNESS

Low Input Ranges (All) dc to 5 MHz 5 MHz to 30 MHz High Input Ranges dc to 5 MHz 5 MHz to 30 MHz

No filter, -1 dB (full scale) @ 50  ±0.1 dB ±0.5 dB No filter, -1 dB (full scale) @ 50  ±0.5 dB ±1 dB

LOW-PASS FILTER

Filter Type VM2601 VM2602 VM2603

3-pole Bessel None, 20 MHz, 40 MHz None, 10 MHz, 20 MHz None, 5 MHz, 10 MHz

INTEGRAL NON-LINEARITY

±0.5 LSB typical

MISSING CODES

Guaranteed no missing codes

DYNAMIC CHARACTERISTICS

SIGNAL-TO-NOISE PLUS DISTORTION RATIO (S/[N+D])*

0.5 V, 1.0 V & 2.0 V input ranges 5 V, 10 V & 20 V input ranges

SPURIOUS FREE DYNAMIC RANGE (SFDR)

0.5 V, 5.0 V input ranges*

1.0 V, 10 V input ranges*

2.0 V, 20 V input ranges*

0.5 V, 5.0 V input ranges**

1.0 V, 10 V input ranges**

2.0 V, 20 V input ranges**

IF input (excluding harmonics) (VM2601 only)

** 20 Hz to 1 MHz, 10 MSa/s, 20 MHz LPF on, FFT size = 16,384 (VM2601/2)

** 1 MHz to 10 MHz, SR

MAX

, (SR

MAX

RMS NOISE

(SR

/2) bandwidth @ 50 Ω

MAX

Source impedance, 0.5 V range

SIGNAL-TO-NOISE RATIO (SNR)

All inputs, all ranges

∗

See Appendix A for information on calculating RMS noise.

69 dB typical, 63 dB minimum 65 dB typical, 60 dB minimum *20 Hz to 30 MHz, SR

low jitter clock

MAX

> 77 dB typical, 75 dB minimum > 80 dB typical, 77 dB minimum > 80 dB typical, 75 dB minimum

> 77 dB typical, 75 dB minimum > 77 dB typical, 75 dB minimum > 77 dB typical, 75 dB minimum

> 80 dB typical, 75 dB minimum

/2) low-pass Filter ON (VM2602/3)

250 µV rms maximum (IFR) (exclusive of any offset)∗

> 62 dB

VM2601/2/3 Introduction 17

VXI Technology, Inc.

ARMING, TRIGGERING, AND CLOCKING

TRIGGER SOURCE

Channel Input, EXT input, Serial Word Command, TTLT bus, Sync

EXTERNAL TRIGGER

Impedance Amplitude Level Accuracy

10 k ±4 V ±5 mV

MAXIMUM PRE-TRIGGER SAMPLES

Available memory – 1

TRIGGER DELAY

0 – 3,600 seconds

INTERNAL CLOCK SOURCE

CLK10

INTERNAL CLOCK ACCURACY

CLK10

EXTERNAL CLOCK MAXIMUM FREQUENCY

VM2601 VM2602 VM2603

80 MHz 40 MHz 20 MHz

EXTERNAL CLOCK IMPEDANCE

50 

ARM SOURCE

EXT, IMM, SYNC, TTLT<0-7>

EXTERNAL ARM

Impedance Amplitude Resolution

10 k ± 4 V 5 mV

BUILT-IN MEASUREMENT FUNCTIONS

MEASUREMENT FUNCTION

• Period

• Rise/Fall Time

• Negative/Positive Pulse Width

• V rms/V cycle rms

• V mean

• V high

• V max

• Frequency

• Negative/Positive Duty Cycle

• Negative/Positive Overshoot/Preshoot

• V peak

• V amplitude

• V low

• V min

ENVIRONMENTAL

OPERATING TEMPERATURE RANGE

0 °C – 60 °C

CALIBRATION TEMPERATURE

25 °C

POWER AND COOLING REQUIREMENTS

VOLTAGE

+5 V

-5.2 V +2 V +24 V

-24 V +12 V

-12 V

* Values in parenthesis represent values in stand by mode

1.86 A (0.6 A)*

0.062 A (0.03 A) 0 A (0 A) 0 A (0 A) 2 A (0 A)

0.25 A (0 A)

0.24 A (0 A)

18 VM2601/2/3 Introduction

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SECTION 2

PREPARATION FOR USE

INSTALLATION

When the VM2601 is unpacked from its shipping carton, the contents should include the following items:

(1) VM2601/2/3 VXIbus module (1) VM2601/2/3 Module User’s (this manual)

All components should be immediately inspected for damage upon receipt of the unit.

Once the VM2601 is assessed to be in good condition, it may be installed into an appropriate C-size or D-size VXIbus chassis in any slot other than slot 0. The chassis should be checked to ensure that it is capable of providing adequate power and cooling for the VM2601. Once the chassis is found adequate, the VM2601’s logical address and the backplane jumpers of the chassis should be configured before the VM2601’s installation.

CALCULATING SYSTEM POWER AND COOLING REQUIREMENTS

The power and cooling requirements of the VM2601 are given in the specification table in Section 1 of this manual. It is imperative that the chassis provide adequate power and cooling for this module. Referring to the chassis user manual, confirm that the power budget for the system (the chassis and all modules installed therein) is not exceeded and that the cooling system can provide adequate airflow at the specified backpressure.

It should be noted that if the chassis cannot provide adequate power to the module, the instrument may not perform to specification or possibly not operate at all. In addition, if adequate cooling is not provided, the reliability of the instrument will be jeopardized and permanent damage may occur. Damage found to have occurred due to inadequate cooling voids the warranty on the instrument in question.

VM2601/2/3 Preparation for Use 19

SETTING THE CHASSIS BACKPLANE JUMPERS

Please refer to the chassis user manual for further details on setting the backplane jumpers.

SETTING THE LOGICAL ADDRESS

The logical address of the VM2601 is set by a single 8-position DIP switch located near the module’s backplane connectors (this is the only switch on the module). The switch is labeled with positions 1 through 8 and with an ON position. A switch pushed toward the ON legend will signify logic 1; switches pushed away from the ON legend will signify logic 0. The switch located at position 1 is the least significant bit while the switch located at position 8 is the most significant bit. See

Figure 2-1 for examples of setting the logical address switch.

VXI Technology, Inc.

ON ON

1ON2345678

SET TO 4

ON ON

12345678

SET TO 168

F

IGURE 2-1: LOGICAL ADDRESS SWITCH-SETTING EXAMPLES

1ON2345678

SET TO 8

1

2345678

SET TO 255

(Dynamic)

Switch

Position

1 2 3 4 5 6 7 8

Switch

Value

1 2 4

8 16 32 64

128

The VMIP may contain three separate instruments and will allocate logical addresses as required by the VXIbus specification (revisions 1.3 and 1.4). The logical address of the instrument is set on the VMIP carrier. The VMIP logical addresses must be set to an even multiple of 4 unless dynamic addressing is used. Switch positions 1 and 2 must always be set to the OFF position. Therefore, only addresses of 4, 8, 12, 16, ... 252 are allowed. The address switch should be set for one of these legal addresses and the address for the second instrument (the instrument in the center position) will automatically be set to the switch set address plus one; while the third instrument (the instrument in the lowest position) will automatically be set to the switch set address plus two. If dynamic address configuration is desired, the address switch should be set for a value of 255 (all switches set to ON). Upon power-up, the slot 0 resource manager will assign the first available logical addresses to each instrument in the VMIP module.

If dynamic address configuration is desired, the address switch should be set for a value of 255. Upon power-up, the slot 0 resource manager will assign logical addresses to each instrument in the VMIP module.

20 VM2601/2/3 Preparation for Use

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SECTION 3

PROGRAMMING

INTRODUCTION

The VM2601 is a VXIbus message-based device whose command set is compliant with the Standard Commands for Programmable Instruments (SCPI) programming language.

All module commands are sent over the VXIbus backplane to the module. Commands may be in upper, lower, or mixed case. All numbers are sent in ASCII decimal unless otherwise noted.

The module recognizes SCPI commands. SCPI is a tree-structured language based on IEEE Std 488.2 specifications. It uses the IEEE Std 488.2 Standard command and the device dependent commands are structured to allow multiple branches off the same trunk to be used without repeating the trunk. To use this facility, end each branch with a semicolon. For example, SLOPe and SOURce are both branches off the TRIGger: command trunk and can be combined as follows:

TRIGger:SLOPe <slope>;SOURce <source>

The above command is the same as these two commands:

TRIGger:SLOPe <slope> TRIGger:SOURce <source>

See the Standard Commands for Programmable Instruments (SCPI) Manual, Volume 1: Syntax & Style, Section 6, for more information.

The SCPI commands in this section are listed in upper and lower case. Character case is used to indicate different forms of the same command. Keywords can have both a short form and a long form (some commands only have one form). The short form uses just the keyword characters in uppercase. The long form uses the keyword characters in uppercase plus the keyword characters in lowercase. Either form is acceptable. Note that there are no intermediate forms. All characters of the short form or all characters of the long form must be used. Short forms and long forms may be freely intermixed. The actual commands sent can be in upper case, lower case, or mixed case (case is only used to distinguish short and long form for the user). As an example, these commands are all correct and all have the same effect:

TRIGger:SLOPe <slope> trigger:slope <slope> TRIGGER:SLOPE <slope> TRIG:SLOPe <slope> TRIGger:SLOP <slope> TRIG:SLOP <slope> trig:slop <slope>

VM2601/2/3 Programming 21

NOTATION

VXI Technology, Inc.

The following command is not correct because it uses part of the long form of TRIGger, but not all the characters of the long form:

:slop <slope> incorrect syntax - extra "g"

trigg

All of the SCPI commands also have a query form unless otherwise noted. Query forms contain a question mark (?). The query form allows the system to ask what the current setting of a parameter is. The query form of the command generally replaces the parameter with a question mark (?). Query responses do not include the command header. This means only the parameter is returned: no part of the command or "question" is returned.

Keywords or parameters enclosed in square brackets ([ ]) are optional. If the optional part is a keyword, the keyword can be included or left out. Omitting an optional parameter will cause its default to be used. If using the optional parameter, the square brackets are omitted from the command or query.

Parameters are enclosed by angle brackets (< >). Braces ({ }) or curly brackets, are used to enclose one or more parameters that may be included zero or more times. A vertical bar (|), read as "or," is used to separate parameter alternatives.

22 VM2601/2/3 Programming

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APPLICATION EXAMPLES

SCPI PROGRAMMING EXAMPLE

This section contains examples of using SCPI command strings for programming the VM2601 module. The code is functional and will contain a brief description of the operation. Note, the SCPI commands used by the VM2601 are explained in detail in

In this example, VM2601 sets the sweep points, sample clock frequency, input range, and trigger source. It returns the average, maximum, minimum, peak-to-peak voltage, and rms voltage of the data collected from a previous run.

SWE:POIN 32768 Sets the number of post trigger samples to

SAMP:CLOC:FREQ 1E4 Sets the sample rate to 10 kHz. INP:RANG 20 Sets the input voltage range to ±20 V. TRIG:SOUR IMM Sets the input trigger source to IMMediate. INIT:IMM Puts the VM2601 into the “waiting for arm”

ARM Arms the VM2601 module immediately. TRIG:IMM Triggers the VM2601 module immediately.

At this point, after 32,768/10,000 seconds, the samples are in the buffer and the CALCulate commands can be executed.

CALC:VOLT:MEAN? Returns the average data value.

15.107537 CALC:VOLT:MAX? Returns the maximum data value collected.

19.234100 CALC:VOLT:MIN? Returns the minimum data value collected.

-12.693521 CALC:VOLT:PTP? Returns the peak-to-peak value starting at

13.451500 the trigger point and continuing to the end

of data collected.

CALC:VOLT:RMS? Returns the true rms value starting at the

4.653781 trigger point and continuing to the end of

the data collected.

Section 4.

32 k.

state.

VM2601/2/3 Programming 23

REGISTER ACCESS EXAMPLE

The VM2601 module provides hardware register access for fast data transfers. The register map is shown in

In order to read the samples, execute an INITiate, ARM, TRIGger sequence as seen in the Programming Example above. Then, use viIn16(instHndl, VI_A32_SPACE, offset, &var16bit) for a single sample or viMoveIn16(instHndl, VI_A32_SPACE, offset, number_of_samples, array16bit) for multiple samples.

To determine the dc voltage value of any sample:

1) Obtain the ADC gain and offset values from the instrument using the commands

2) Calculate the voltage as follows:

For example, in the 5 V range, for a sample value of 12,684, where ADC_Gain is 1.237854 and ADC_Offset is 8183:

The VM2601 digitizer’s sample memory is mapped into the VXI A32 address space by the VISA resource manager. When accessing the sample data through a call to viIn16() or viMoveIn16(), it is not necessary to know the absolute address assigned to the module. VISA uses the session handle to reference the assigned address space.

Table 3-1.

CAL:ADC:GAIN <FAST|SLOW> and CAL:ADC:OFFS? <FAST|SLOW>.

voltage

=

where ‘range’ is the current input range that has been programmed.

=

(

0.16383

()

0.16383

5.00.2237854.1818312684

×××−

=

VXI Technology, Inc.

SCPI

range2.0ADC_Gain)ADC_Offset - value ample(double)(s

×××

volts voltage 340083.0

24 VM2601/2/3 Programming

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ABLE 3-1: A16 MEMORY MAP

T

3E

3C

3A

38

36

34

32

30

2E

2C

2A

28

26

24

22

20

1E

1C

1A

18

16

14

12

10

E

C

A

8

6

4

2

0

[A32 Pointer Low]

[A32 Pointer High]

Response [/Data Extended]

Protocol [/Signal] Register

[Offset Register]

Status / Control Register

Data Low Data High

Device Type

ID Register

VM2601/2/3 Programming 25

VXI Technology, Inc.

VXIPLUG&PLAY DRIVER EXAMPLE

This example shows how to access the instrument using the VXIplug&play driver.

// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - // vtvm2601_appFunc() Example of how to access the instrument using the driver // Parameters: // ViSession instHndl Session handle issued by the resource manager // ViInt16 inputSelect Selects DSO or IFR input (For the VM2602 and VM2603, DSO is the only valid selection) // ViInt16 adcSelect If DSO, selects fast or slow ADC // ViInt16 rangeSelect If DSO, selects input range // ViInt16 inputCoupling If DSO, selects input coupling // ViReal64 sampleRate sets the sample rate // ViInt32 sampleCount sets the sample count // ViInt16 dPointer[] points to storage for the data // Returns: VI_SUCCESS or error code // - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - ViStatus _VI_FUNC vtvm2601_appFunc(ViSession instHndl, ViInt32 inputSelect, ViInt32 adcSelect, ViInt32 rangeSelect, ViInt32 inputCoupling, ViReal64 sampleRate, ViInt32 sampleCount, ViInt16 _VI_FAR dPointer[]) { ViStatus iStatus; ViInt32 segNmbr, ramOffs, ptrgCnt; ViInt32 loopCnt, operCond, daqState;

iStatus = vtvm2601_setInpSour(instHndl, inputSelect); // select the input if(iStatus < VI_SUCCESS) return(iStatus); iStatus = vtvm2601_setAdcType(instHndl, adcSelect); // select the ADC if(iStatus < VI_SUCCESS) return(iStatus); iStatus = vtvm2601_setInpRange(instHndl, rangeSelect); // set the range if(iStatus < VI_SUCCESS) return(iStatus); iStatus = vtvm2601_setInpCoup(instHndl, inputCoupling); // set the input coupling if(iStatus < VI_SUCCESS) return(iStatus); iStatus = vtvm2601_setSclkFreq(instHndl, sampleRate); // set the sample rate if(iStatus < VI_SUCCESS) return(iStatus); iStatus = vtvm2601_setSampCnt(instHndl, sampleCount); // set the sample count if(iStatus < VI_SUCCESS) return(iStatus);

ptrgCnt = sampleCount; // make pre-trigger = sampleCount iStatus = vtvm2601_setPreTrig(instHndl, ptrgCnt); if(iStatus < VI_SUCCESS) return(iStatus);

iStatus = vtvm2601_initiate(instHndl); // initiate the operation if(iStatus < VI_SUCCESS) return(iStatus); iStatus = vtvm2601_cmdArmImme(instHndl); if(iStatus < VI_SUCCESS) return(iStatus); lclDelay((double)ptrgCnt / sampleRate); // WAIT at least long enough for pre-trig

iStatus = vtvm2601_cmdTrigImme(instHndl); if(iStatus < VI_SUCCESS) return(iStatus); lclDelay((double)sampleCount / sampleRate); // WAIT at least long enough for samples

// now, query the machine state for(loopCnt = 0; loopCnt < 1000; loopCnt++) { iStatus = vtvm2601_qryOperCondReg(instHndl, &operCond); if(iStatus < VI_SUCCESS) return(iStatus); if((operCond & vtvm2601_OPER_MEAS) != vtvm2601_OPER_MEAS)

26 VM2601/2/3 Programming

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break; }

iStatus = vtvm2601_abort(instHndl); // ready or not, abort the operation! if(iStatus < VI_SUCCESS) return(iStatus); if(daqState != vtvm2601_DAS_IDLE) // didn't make it to idle, data not ready! return(vtvm2601_ERR_NOT_READY);

segNmbr = 0; // segment number = 0, use the first segment ramOffs = 0; // ram offset = 0, first sample from the trigger point // Now, get the samples! iStatus = vtvm2601_a32Fetch(instHndl, segNmbr, ramOffs, sampleCount, dPointer); return(iStatus); }

VM2601/2/3 Programming 27

VXI Technology, Inc.

28 VM2601/2/3 Programming

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SECTION 4

COMMAND DICTIONARY

INTRODUCTION

This section presents the instrument command set. It begins with an alphabetical list of all the commands supported by the VM2601 divided into three sections: IEEE 488.2 commands, the instrument specific SCPI commands, and the required SCPI commands. Each command provides a brief description of the command’s function, whether the command’s value is affected by the *RST command, and, if applicable, its *RST value.

The remainder of this section is devoted to describing each command, one per page, in detail. The description is presented in a regular and systematic manner, assisting the user in the use of each command. Every command entry describes the exact command and query syntax, the use and range of parameters, and a complete description of the command’s purpose.

ALPHABETICAL COMMAND LISTING

The following tables provide an alphabetical listing of each command supported by the VM2601 along with a brief description. If an X is found in the column titled *RST, then the value or setting controlled by this command is possibly changed by the execution of the *RST command. If no X is found, then *RST has no effect. The *RST column gives the value of each command’s setting when the unit is powered up or when an *RST command is executed.

VM2601/2/3 Command Dictionary 29

*CLS *ESE *ESR? *IDN? *OPC *RST *SRE *STB? *TRG *TST? *WAI

VXI Technology, Inc.

TABLE 4-1: IEEE 488.2 COMMON COMMANDS

Command Description *RST *RST Value

Clears the Status Register N/A Sets the Event Status Enable Register N/A Query the Standard Event Status Register N/A Query the module identification string N/A Set the OPC bit in the Event Status Register N/A Resets the module to a known state N/A Set the Service Request Enable Register N/A Query the Status Byte Register N/A Causes a trigger event to occur N/A Starts and reports a self-test procedure N/A Halts execution of commands and queries N/A

30 VM2601/2/3 Command Dictionary

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Command Description *RST *RST Value

ABORt ARM:AUTO

ARM:LEVel ARM:SLOPe ARM:SOURce ARM:STATe? ARM[:IMMediate] CALCulate:FALL:TIMe?

CALCulate:FREQuency? CALCulate:NDUTy? CALCulate:NWIDth? CALCulate:PDUTy? CALCulate:PERCent:NOVershoot? CALCulate:PERCent:NPReshoot? CALCulate:PERCent:NRINging?

CALCulate:PERCent:POVershoot? CALCulate:PERCent:PPReshoot?

CALCulate:PERCent:PRINging? CALCulate:PERiod?

CALCulate:PWIDth? CALCulate:RISE:TIMe? CALCulate:VOLTage:AMPLitude? CALCulate:VOLTage:HIGH?

CALCulate:VOLTage:LOW? CALCulate:VOLTage:MAXimum?

CALCulate:VOLTage:MEAN? CALCulate:VOLTage:MINimum?

CALCulate:VOLTage:NOVershoot? CALCulate:VOLTage:NPReshoot? CALCulate:VOLTage:NRINging?

CALCulate:VOLTage:POVershoot? CALCulate:VOLTage:PPReshoot?

TABLE 4-2: INSTRUMENT SPECIFIC SCPI COMMANDS

Disarms the VM2601 and stops data sampling. N/A Enables or disables automatic advancing to the next buffer and rearming.

X OFF

Sets the comparator level of the Arm Signal. X 0.0 Specifies the slope of the Arm Signal. X POS Sets the Arm Source. X IMMediate Query returns whether or not the VM2601 is armed. Advances to the next buffer and arms the unit. N/A Instructs the device to return the fall time measurement for the acquired data. Query that instructs the device to return the frequency of the digitized data. Instructs the device to calculate and return the negative duty cycle for the acquired data. Returns the negative pulse width measurement for the acquired data. Instructs the device to calculate and return the positive duty cycle for the acquired data. Returns the negative overshoot as percent of amplitude Returns the negative preshoot as percent of amplitude Returns the negative ringing as percent of amplitude Returns the positive overshoot as percent of amplitude Returns the positive preshoot as percent of amplitude Returns the positive ringing as percent of amplitude Returns the period measurement for the acquired data. Query that returns a positive pulse width measurement. Returns the rise-time measurement for the acquired data. Returns the amplitude measurement for the data being acquired. Returns the high voltage value for the acquired data. Returns the low voltage value for the acquired data. Returns the maximum voltage value for the acquired data. Returns the mean voltage value for the acquired data. Returns the minimum voltage value for the acquired data. Returns the negative overshoot value for the acquired data. Returns the negative preshoot value for the acquired data. Returns the negative ringing as peak-to-peak volts Returns the positive overshoot value for the acquired data. Returns the positive preshoot value for the acquired data.

VM2601/2/3 Command Dictionary 31

Command Description *RST *RST Value

CALCulate:VOLTage:PRINging? CALCulate:VOLTage:PTPeak?

CALCulate:VOLTage:RMS? CALibration:ADC:GAIN CALibration:ADC:OFFSet CALibration:COUNt? CALibration:DAC:GAIN CALibration:DAC:OFFSet CALibration:DEFault

CALibration:RESet CALibration:SECure:CODE

CALibration:SECure[:STATe] CALibration:STORe COMBine:FEED

CONFigure:ADC CONFigure:FALL:TIMe

CONFigure:FREQuency CONFigure:HORizontal:RESolution

CONFigure:NDUTy

CONFigure:NWIDth

CONFigure:PDUTy

CONFigure:PERCent:NOVershoot CONFigure:PERCent:NPReshoot CONFigure:PERCent:NRINging CONFigure:PERCent:POVershoot CONFigure:PERCent:PPReshoot CONFigure:PERCent:PRINging CONFigure:PERiod

VXI Technology, Inc.

Returns the positive ringing as peak-to-peak volts Returns the peak-to-peak voltage value for the acquired data. Returns the root-mean-square (rms) voltage value of the data being acquired. To provide an ADC gain factor for measurement compensation. To provide an ADC offset value for measurement compensation. Tracks the number of times calibration memory has been written. To set the calibration factor that compensates for DAC gain inaccuracies. To set the calibration factor that compensates for DAC offset inaccuracies.

1.000

8192

1.000 or

Cal Value

2047 or

Cal Value Sets all calibration factors to their default values. Resets all calibration factors to the values stored in the non-volatile memory (EEPROM). Sets the code required to disable calibration security. Enable or disable calibration security. X ON Stores calibration data into non-volatile memory. Sets a marker for specified events allowing for easy reference after acquisition is complete.

X GND

Selects between the fast and slow ADCs. X FAST Defines the fall time parameters that will govern corresponding CALCulate and MEASure commands. Defines the frequency parameters that will govern corresponding CALCulate and MEASure commands. Sets the sample period for the ADC X 100.0 ns Defines the negative duty cycle parameters that will govern corresponding CALCulate and MEASure commands. Defines the negative pulse width parameters that will govern corresponding CALCulate and MEASure commands. Defines the positive duty cycle parameters that will govern corresponding CALCulate and MEASure commands. configure to measure negative overshoot as percent of amplitude configure to measure negative preshoot as percent of amplitude configure to measure negative ringing as percent of amplitude configure to measure positive overshoot as percent of amplitude configure to measure positive preshoot as percent of amplitude configure to measure positive ringing as percent of amplitude Defines the period parameters that will govern corresponding CALCulate and MEASure commands.

32 VM2601/2/3 Command Dictionary

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Command Description *RST *RST Value

CONFigure:PWIDth

CONFigure:RISE:TIMe CONFigure:SAR:TIMe CONFigure:SAR:TIMe?

CONFigure:VOLTage:AMPLitude CONFigure:VOLTage:HIGH CONFigure:VOLTage:LOW CONFigure:VOLTage:MAXimum

CONFigure:VOLTage:MEAN CONFigure:VOLTage:MINimum

CONFigure:VOLTage:NOVershoot

CONFigure:VOLTage:NPReshoot

CONFigure:VOLTage:NRINging CONFigure:VOLTage:POVershoot

CONFigure:VOLTage:PPReshoot

CONFigure:VOLTage:PRINging CONFigure:VOLTage:PTPeak

CONFigure:VOLTage:RMS

CONFigure? CONTrol:IPOWer

FETCh? INITiate:DELay

INITiate[:IMMediate] INPut:COUPling

Defines the positive pulse width parameters that will govern corresponding CALCulate and MEASure commands. Defines the rise time parameters that will govern corresponding CALCulate and MEASure commands. configure the Signal Aberration Region size in seconds query the Signal Aberration Region size Defines the amplitude parameters that will govern corresponding CALCulate and MEASure commands. Defines the high voltage parameters that will govern corresponding CALCulate and MEASure commands. Defines the low voltage parameters that will govern corresponding CALCulate and MEASure commands. Defines the maximum voltage parameters that will govern corresponding CALCulate and MEASure commands. Defines the mean voltage parameters that will govern corresponding CALCulate and MEASure commands. Defines the minimum voltage parameters that will govern corresponding CALCulate and MEASure commands. Defines the negative overshoot parameters that will govern corresponding CALCulate and MEASure commands. Defines the negative preshoot parameters that will govern corresponding CALCulate and MEASure commands. configure to measure negative ringing as peak-topeak volts Defines the positive overshoot parameters that will govern corresponding CALCulate and MEASure commands. Defines the positive preshoot parameters that will govern corresponding CALCulate and MEASure commands. configure to measure positive ringing as peak-topeak volts Defines the peak-to-peak voltage parameters that will govern corresponding CALCulate and MEASure commands. Defines the root-mean-square voltage parameters that will govern corresponding CALCulate and MEASure commands. Outputs the current measurement configuration. This command applies power to or removes power from the instrument. Retrieves the measurements taken by the INITiate command and places it in the output buffer.

X ON

Set the pre-trigger sample count. X 1024 Arms the VM2601 upon receipt of the command. Selects ac or dc coupling on the specified input channel.

X DC

VM2601/2/3 Command Dictionary 33

Command Description *RST *RST Value

INPut:FILTer:FREQuency INPut:FILTer:STATe INPut:IMPedance INPut:OFFSet INPut:RANGe INPut:SOURce MEASure:FALL:TIMe? MEASure:FREQuency? MEASure:NDUTy? MEASure:NWIDth? MEASure:PDUTy? MEASure:PERCent:NOVershoot?

MEASure:PERCent:NPReshoot? MEASure:PERCent:NRINging? MEASure:PERCent:POVershoot? MEASure:PERCent:PPReshoot? MEASure:PERCent:PRINging? MEASure:PERiod?

MEASure:PWIDth? MEASure:RISE:TIMe? MEASure:VOLTage:AMPLitude? MEASure:VOLTage:HIGH? MEASure:VOLTage:LOW? MEASure:VOLTage:MAXimum? MEASure:VOLTage:MEAN? MEASure:VOLTage:MINimum? MEASure:VOLTage:NOVershoot? MEASure:VOLTage:NPReshoot? MEASure:VOLTage:NRINging?

MEASure:VOLTage:POVershoot?

VXI Technology, Inc.

Selects the low-pass filter corner frequency for the specified channel. For the specified input channel, turns the currently selected low-pass filter ON or OFF. Sets the input impedance for the selected input channel. This command allows the user to compensate for input signal offset. Sets the input range to ±0.5 V, ±1.0 V, ±2.0 V, ±5.0 V, ±10.0 V, or ±20.0 V full scale Select the input source, single-ended IFR or differential DSO. Performs a sequence of commands to provide a fall time measurement for the input. Performs a sequence of commands to provide a frequency measurement for the input. Performs a sequence of commands to provide the negative duty cycle measurement for the input. Performs a sequence of commands to provide a negative pulse width measurement for the input. Performs a sequence of commands to provide a positive duty cycle measurement for the input.

X 20e6 Hz

X OFF

X High

X 0.0

X 20.0 V

X DSO

measure negative overshoot as percent of amplitude measure negative preshoot as percent of amplitude measure negative ringing as percent of amplitude measure positive overshoot as percent of amplitude measure positive preshoot as percent of amplitude measure positive ringing as percent of amplitude Performs a sequence of commands to provide a period measurement for the input. Performs a sequence of commands to provide a positive pulse width measurement for the input. Performs a sequence of commands to provide a rise time measurement for the input. Performs a sequence of commands to provide an amplitude measurement for the acquired data. Performs a sequence of commands to provide the high voltage value for the acquired data. Performs a sequence of commands to provide the low voltage value for the acquired data. Performs a sequence of commands to provide the maximum voltage value for the acquired data. Performs a sequence of commands to provide the mean voltage value for the acquired data. Performs a sequence of commands to provide the minimum volgage value for the acquired data. Performs a sequence of commands to provide the negative overshoot value for the acquired data. Performs a sequence of commands to provide the negative preshoot value for the acquired data. measure negative ringing as peak-to-peak volts Performs a sequence of commands to provide the positive overshoot value for the acquired data

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Command Description *RST *RST Value

MEASure:VOLTage:PPReshoot? MEASure:VOLTage:PRINging?

MEASure:VOLTage:PTPeak? MEASure:VOLTage:RMS? READ? ROSCillator:FREQuency

ROSCillator:SOURce SAMPle:CLOCk:FREQuency SAMPle:CLOCk:SOURce SWEep:COUNt SWEep:POINts SWEep:TINTerval SYNChronize:MODE

SYNChronize:STATe TRIGger:LEVel TRIGger:SLOPe

TRIGger:SOURce TRIGger:STATe?

TRIGger[:IMMediate]

Performs a sequence of commands to provide the positive preshoot value for the acquired data. measure positive ringing as peak-to-peak volts Performs a sequence of commands to provide the peak-to-peak voltage value for the acquired data. Performs a sequence of commands to provide the root-mean-square value for the acquired data. Initiates, arms, triggers, and fetches a previously configured measurement. Sets the reference oscillator frequency. X 10 MHz Selects the reference oscillator source. X BUS Outputs the selected sample clock frequency. X 10 MHz Selects the sample clock source. X INTernal Set the number of segments. X 1 Set the post-trigger sample count. X 1024 This command sets the sample rate for the ADC. X 100 ns (Fast) Sets the instrument to function as a synchronized master or slave.

X OFF

Enables/disables synchronization operations. X OFF Sets the comparator level of the trigger signal. X 0.0 V Specifies the slope of the Trigger Signal for the VM2601.

X POS

Selects the source for triggering the VM2601. X IMMediate Query returns whether or not the VM2601 has been triggered.

X 0

Triggers the instrument on receipt of the command.

VM2601/2/3 Command Dictionary 35

Command Description *RST *RST Value

STATus:OPERation:CONDition? STATus:OPERation:ENABle STATus:OPERation[:EVENt]? STATus:PRESet

STATus:QUEStionable:CONDition? STATus:QUEStionable:ENABle STATus:QUEStionable[:EVENt]? SYSTem:ERRor?

SYSTem:VERSion?

TABLE 4-3: SCPI REQUIRED COMMANDS

Queries the Operation Status Condition Register. Sets the Operation Status Enable Register. Queries the Operation Status Event Register. Presets the Status Register. N/A Queries the Questionable Status Condition Register. Sets the Questionable Status Enable Register. Queries the Questionable Status Event Register. Queries the Error Queue. X Clears queue Queries which version of the SCPI standard the module complies with.

VXI Technology, Inc.

N/A

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COMMAND DICTIONARY

The remainder of this section is devoted to the actual command dictionary. Each command is fully described on its own page. In defining how each command is used, the following items are described:

Purpose

Type

Command Syntax

Command Parameters

Reset Value

Query Syntax

Query Parameters

Query Response

Description

Examples

Related Commands

Describes the purpose of the command.

Describes the type of command such as an event or setting.

Details the exact command format.

Describes the parameters sent with the command and their legal range.

Describes the values assumed when the *RST command is sent.

Details the exact query form of the command.

Describes the parameters sent with the command and their legal range. The default parameter values are assumed the same as in the command form unless described otherwise.

Describes the format of the query response and the valid range of output.

Describes in detail what the command does and refers to additional sources.

Present the proper use of each command and its query (when available).

Lists commands that affect the use of this command or commands that are affected by this command.

VM2601/2/3 Command Dictionary 37

COMMON SCPI COMMANDS

*CLS

VXI Technology, Inc.

Purpose

Type

Command Syntax

Command Parameters

*RST Value

Query Syntax

Query Parameters

Query Response

Description

Clears all status and event registers.

IEEE 488.2 Common Command

*CLS

None

N/A

None

N/A

This command clears the Status Event Register, Operation Status Register, and the Questionable Data/Signal Register. It also clears the Operation Complete flag and clears all queues (except the output queue).

Examples Command / Query Response (Description)

Related Commands

*CLS

N/A

(Clears all status and event registers)

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*ESE

Purpose

Type

Command Syntax

Command Parameters

*RST Value

Query Syntax

Query Parameters

Query Response

Description

Examples Command / Query Response (Description)

Related Commands

Sets the bits of the Event Status Enable Register.

IEEE 488.2 Common Command

*ESE <mask>

<mask> = numeric ASCII value

N/A, the parameter is required

*ESE?

N/A

Numeric ASCII value from 0 to 255

The Event Status Enable (ESE) command is used to set the bits of the Event Status Enable Register. See ANSI/IEEE 488.2-1987 section 11.5.1 for a complete description of the ESE register. A value of 1 in a bit position of the ESE register enables generation of the Event Status Bit (ESB) in the Status Byte by the corresponding bit in the Event Status Register (ESR). If the ESB is set in the Service Request Enable (SRE) register, then an interrupt will be generated. See the query for details regarding the individual bits. The ESE register layout is:

Bit 0 - Operation Complete Bit 1 - Request Control Bit 2 - Query Error Bit 3 - Device Dependent Error Bit 4 - Execution Error Bit 5 - Command Error Bit 6 - User Request Bit 7 - Power On

The Event Status Enable query reports the current contents of the Event Status Enable Register.

*ESE 36 *ESE?

*ESR?

36 (Returns the value of the event status enable register)

*ESR?

VM2601/2/3 Command Dictionary 39

*ESR?

VXI Technology, Inc.

Purpose

Type

Command Syntax

Command Parameters

*RST Value

Query Syntax

Query Parameters

Query Response

Description

Examples Command / Query Response (Description)

Related Commands

Queries and clears the Standard Event Status Register.

IEEE 488.2 Common Command

None

N/A

*ESR?

None

Numeric ASCII value from 0 to 255

The Event Status Register (ESR) query - queries and clears the contents of the Standard Event Status Register. This register is used in conjunction with the ESE register to generate the Event Status Bit (ESB) in the Status Byte. The layout of the ESR is:

Bit 0 - Operation Complete Bit 1 - Request Control Bit 2 - Query Error Bit 3 - Device Dependent Error Bit 4 - Execution Error Bit 5 - Command Error Bit 6 - User Request Bit 7 - Power On

The Operation Complete bit is set when it receives an *OPC command.

The Query Error bit is set when data is over-written in the output queue. This could occur if one query is followed by another without reading the data from the first query.

The Execution Error bit is set when an execution error is detected. Errors that range from -200 to -299 are execution errors.

The Command Error bit is set when a command error is detected. Errors that range from -100 to -199 are command errors.

The Power On bit is set when the module is first powered on or after it receives a reset via the VXI Control Register. Once the bit is cleared (by executing the *ESR? command) it will remain cleared.

*ESR?

*ESE

4

40 VM2601/2/3 Command Dictionary

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*IDN?

Purpose

Type

Command Syntax

Command Parameters

*RST Value

Query Syntax

Query Parameters

Query Response

Description

Queries the module for its identification string.

IEEE 488.2 Common Command

None

N/A

*IDN?

None

ASCII character string

The Identification (IDN) query returns the identification string of the module. The response is divided into four fields separated by commas. The first field is the manufacturer’s name, the second field is the model number, the third field is an optional serial number, and the fourth field is the firmware revision number. If a serial number is not supplied, the third field is set to 0 (zero).

Examples Command / Query Response (Description)

Related Commands

*IDN?

N/A

VXI Technology, Inc.,VM2601,0,1.0

(The revision listed here is for reference only; the response will always be the current revision of the instrument.)

VM2601/2/3 Command Dictionary 41

*OPC

VXI Technology, Inc.

Purpose

Type

Command Syntax

Command Parameters

*RST Value

Query Syntax

Query Parameters

Query Response

Description

Sets the OPC bit in the Event Status Register.

IEEE 488.2 Common Command

*OPC

None

N/A

*OPC?

None

1

The Operation Complete (OPC) command sets the OPC bit in the Event Status Register when all pending operations have completed. The OPC query will return a 1 to the output queue when all pending operations have completed.

Examples Command / Query Response (Description)

Related Commands

*OPC *OPC?

*WAI

(Sets the OPC bit in the Event Status Register)

1 (Returns the value of the Event Status Register)

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*RST

Purpose

Type

Command Syntax

Command Parameters

*RST Value

Query Syntax

Query Parameters

Query Response

Description

Resets the module’s hardware and software to a known state.

IEEE 488.2 Common Command

*RST

None

N/A

None

N/A

The Reset (RST) command resets the module’s hardware and software to a known state. See the default parameter values used with this command.

Alphabetical Command Listing at the beginning of this chapter for the

Examples Command / Query Response (Description)

Related Commands

*RST

N/A

(Resets the module)

VM2601/2/3 Command Dictionary 43

*SRE

VXI Technology, Inc.

Purpose

Type

Command Syntax

Command Parameters

*RST Value

Query Syntax

Query Parameters

Query Response

Description

Examples Command / Query Response (Description)

Related Commands

Sets the service request enable register.

IEEE 488.2 Common Command

*SRE <mask>

<mask> = Numeric ASCII value from 0 to 255

TBD

*SRE?

None

Numeric ASCII value from 0 to 255

The Service Request Enable (SRE) mask is used to control which bits in the status byte generate back plane interrupts. If a bit is set in the mask that newly enables a bit set in the status byte and interrupts are enabled, the module will generate a REQUEST TRUE event via an interrupt. See the

Note:

Bit 6 is always internally cleared to zero as required by IEEE 488.2 section 11.3.2.3.

The layout of the Service Request Enable Register is:

Bit 0 - Unused Bit 1 - Unused Bit 2 - Error Queue Has Data Bit 3 - Questionable Status Summary (Not Used) Bit 4 - Message Available Bit 5 - Event Status Summary Bit 6 - 0 (per IEEE 488.2 section 11.3.2.3) Bit 7 - Operation Status Summary

*SRE 4 *SRE?

N/A

*STB? query for the layout of bits.

(Sets the service request enable register)

4 (Returns the value of the SRE register)

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*STB?

Purpose

Type

Command Syntax

Command Parameters

*RST Value

Query Syntax

Query Parameters

Query Response

Description

Examples Command / Query Response (Description)

Related Commands

Queries the Status Byte Register.

IEEE 488.2 Common Command

None

N/A

*STB?

None

Numeric ASCII value from 0 to 255

The Read Status Byte (STB) query fetches the current contents of the Status Byte Register. See the IEEE 488.2 specification for additional information regarding the Status byte Register and its use. The layout of the Status Register is:

Bit 0 - Unused Bit 1 - Unused Bit 2 - Error Queue Has Data Bit 4 - Questionable Status Summary (not used) Bit 5 - Message Available Bit 6 - Master Summary Status Bit 7 - Operation Status Summary

*STB?

N/A

16 (Queries the Status Byte Register)

VM2601/2/3 Command Dictionary 45

*TRG

VXI Technology, Inc.

Purpose

Type

Command Syntax

Command Parameters

*RST Value

Query Syntax

Query Parameters

Query Response

Description

Causes a trigger event to occur.

IEEE 488.2 Common Command

*TRG

None

N/A

None

N/A

The Trigger command causes a trigger event to occur.

Examples Command / Query Response (Description)

Related Commands

*TRG

N/A

(Triggers an event)

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*TST?

Purpose

Type

Command Syntax

Command Parameters

*RST Value

Query Syntax

Query Parameters

Query Response

Description

Causes a self-test procedure to occur and queries the results.

IEEE 488.2 Common Command

None

N/A

*TST?

N/A

Numeric ASCII value from 0 to 1.

Initiates the digitizer self-test operation. If the test fails, an error message is placed in the error queue and then the error LED blinks. The self test tests the following:

0 = Passed 1 = Failed sample RAM test

Examples Command / Query Response (Description)

Related Commands

*TST?

N/A

0 (Begins the self-test procedure returns the result)

VM2601/2/3 Command Dictionary 47

*WAI

VXI Technology, Inc.

Purpose

Type

Command Syntax

Command Parameters

*RST Value

Query Syntax

Query Parameters

Query Response

Description

Halts execution of additional commands and queries until the No Operation Pending message is true.

IEEE 488.2 Common Command

*WAI

None

N/A

None

N/A

The Wait to Continue command halts the execution of commands and queries until the No Operation Pending message is true. This command makes sure that all previous commands have been executed before proceeding. It provides a way of synchronizing the module with its commander.

Examples Command / Query Response (Description)

Related Commands

*WAI

*OPC

(Pauses the execution of additional commands until the No Operation Pending message is true.)

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INSTRUMENT SPECIFIC SCPI COMMANDS

ABORt

Purpose

Type

Command Syntax

Command Parameters

*RST Value

Query Syntax

Query Parameters

Query Response

Description

Aborts any active measurement process.

Event

ABORt

None

N/A

None

N/A

The Abort command disarms the VM2601 and stops data sampling (if active).

Examples Command / Query Response (Description)

Related Commands

ABOR

INITiate[:IMMediate]

(Stops data sampling and disarms the module)

VM2601/2/3 Command Dictionary 49

ARM:AUTO

VXI Technology, Inc.

Purpose

Type

Command Syntax

Command Parameters

*RST Value

Query Syntax

Query Parameters

Query Response

Description

Examples Command / Query Response (Description)

Related Commands

Enables or disables the automatic rearm process.

Command

ARM:AUTO <boolean>

<boolean> = 0 | 1 | OFF | ON

OFF

ARM:AUTO?

None

Returns the value currently selected for the <boolean> parameter

This command enables or disables the automatic re-arm process. This applies to multiple segment acquisitions only (see an example, assume that the VM2601 is configured for 64 segments, auto-rearm is enabled, the input trigger source is selected, and the input signal is a repetetive pulse burst with a duration of [0.1 * (sample rate * number of samples)] occurring at random intervals. If an “INIT” command is sent followed by an “ARM” command, it will set up the instrument to acquire a “snapshot” of each burst, which is triggered by the input signal, and each “snapshot” will be stored in separate segment. If auto-rearm were disabled, it would be necessary to rearm the instrument between bursts with an external signal or a software command.

ARM:AUTO 1 ARM:AUTO?

ARM ARM:IMMediate ARM:LEVel ARM:SLOPe ARM:SOURce SWEep:COUNt

SWEep:COUNt for more information on segments). As

(Enables the automatic rearm process.)

1 (Indicates that the automatic rearm process is enabled.)

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ARM[:IMMediate]

Purpose

Type

Command Syntax

Command Parameters

*RST Value

Query Syntax

Query Parameters

Query Response

Description

Arms the instrument on receipt of the command.

Command

ARM[:IMMediate]

None

N/A

None

N/A

Arms the instrument on receipt of the command and puts the device into Waiting For Trigger mode.

Examples Command / Query Response (Description)

Related Commands

ARM:IMM

ARM ARM:LEVel ARM:SLOPe ARM:SOURce

(Arms VM2601)

VM2601/2/3 Command Dictionary 51

ARM:LEVel

VXI Technology, Inc.

Purpose

Type

Command Syntax

Command Parameters

*RST Value

Query Syntax

Query Parameters

Query Response

Description

Sets the level at which the instrument will be armed (external input).

Command

ARM:LEVel <arm_level>

<arm_level> = -4 V to +4 V

<arm_level> = 0.0

ARM:LEVel?

None

Returns the value currently set for the <arm_level> parameter.

Sets the level at which the instrument will be armed by a signal present at the ARM/GP1 input, assuming that ARM:SOURce EXT has been selected. The range is approximately ±4 V.

Examples Command / Query Response (Description)

Related Commands

ARM:LEV 2.56

ARM ARM:IMMediate ARM:SLOPe ARM:SOURce

(Sets the comparator level to 2.56 V)

52 VM2601/2/3 Command Dictionary

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ARM:SLOPe

Purpose

Type

Command Syntax

Command Parameters

*RST Value

Query Syntax

Query Parameters

Query Response

Description

Specifies the slope of the arm signal.

Command

ARM:SLOPe <arm_slope>

<arm_slope> = POSitive | NEGative

<arm_slope> = POSitive

ARM:SLOPe?

None

POS | NEG

Specifies the slope of the arm signal when the arm source is set to EXTernal or TTL.

Examples Command / Query Response (Description)

Related Commands

ARM:SLOP NEG ARM:SLOP?

ARM ARM:IMMediate ARM:LEVel ARM:SOURce

(Sets the VM2601 to arm on a negative slope.)

NEG (Indicates that the VM2601 will arm on a negative slope.)

VM2601/2/3 Command Dictionary 53

ARM:SOURce

VXI Technology, Inc.

Purpose

Type

Command Syntax

Command Parameters

*RST Value

Query Syntax

Query Parameters

Query Response

Description

Sets the arm source.

Command

ARM:SOURce <arm_source>

<arm_source> = EXTernal | IMMediate | SYNC | TTLT<0-7>

<arm_source> = IMMediate

ARM:SOURce?

None

Returns the value currently selected for the <arm_source> parameter.

Sets the arm source:

EXT : ARM/GP1 input IMM : software command (ARM:IMM) SYNC : Master/Slave SYNC subsystem TTLT : VXIbus TTL backplane trigger

Examples Command / Query Response (Description)

Related Commands

ARM:SOUR TTLT3 ARM:SOUR?

ARM ARM:IMMediate ARM:LEVel ARM:SLOPe

(Sets the arm source to TTLT3.)

TTLT3 (Indicates that the arm source is the TTLT3 line.)

54 VM2601/2/3 Command Dictionary

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olta

g

)

CALCulate:FALL:TIMe

Purpose

Type

Command Syntax

Command Parameters

*RST Value

Query Syntax

Query Parameters

Query Response

Description

Query that instructs the device to calculate and return fall time measurement.

Query

None

N/A

CALCulate:FALL:TIMe? or CALCultate:FTIMe?

None

ASCII number representing fall-time measurement

The CALCulate:FALL:TIME query instructs the instrument to calculate and return the amount of time it takes a signal to make a negative transition from the high reference to the low reference. The high reference defaults to 90% of the signal amplitude, and the low reference defaults to 10% of the signal amplitude.

1.0

0.8

90% referenc e

0.6

e (V

v

0.4

0.2

20

6 8 10 12 14 16 18

4

time ( s)µ

Fall

Time

To correctly perform a CALCulate function, a data set must be acquired (INITiate, ARM, TRIGger), and the data may be transferred to the host (register access) before the execution CALC query. This sequence is not a prerequisite for sending a CALCulate query, but is required for valid data to be returned.

Examples Command / Query Response (Description)

Related Commands

CALC:FTIM?

CONFigure:FALL:TIMe

(Returns the fall time measurement.)

MEASure:FALL:TIMe

10% referenc e

20

VM2601/2/3 Command Dictionary 55

CALCulate:FREQuency?

VXI Technology, Inc.

Purpose

Type

Command Syntax

Command Parameters

*RST Value

Query Syntax

Query Parameters

Query Response

Description

Query that instructs the device to calculate and return the frequency of the digitized data.

Query

None

N/A

CALCulate:FREQuency?

None

ASCII number representing frequency measurement in Hz.

The CALCulate:FREQuency query instructs the device to calculate and return the frequency of the digitized data. Frequency (f) is a measure of how many times a signal repeats in one second (1/s = Hz). This is also equal to 1/period (or 1/T).

To correctly perform a CALCulate function, a data set must be acquired (INITiate, ARM, TRIGger), and the data may be transferred to the host (register access) before the execution CALC query. This sequence is not a prerequisite for sending a CALCulate query, but is required for valid data to be returned.

Examples Command / Query Response (Description)

Related Commands

CALC:FREQ?

CONFigure:FREQuency MEASure:FREQuency

(Returns the frequency measurement.)

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CALCulate:NDUTy?

Purpose

Type

Command Syntax

Command Parameters

*RST Value

Query Syntax

Query Parameters

Query Response

Description

Query that instructs the device to calculate and return the negative duty cycle.

Query

None

N/A

CALCulate:NDUTy?

None

ASCII number representing negative duty cycle measurement as a percentage

The CALCulateNDUTy query instructs the device to calculate and return the negative duty cycle of the digitized data. The negative duty cycle is defined as the negative pulse width divided by the period and is expressed as a percentage.

To correctly perform a CALCulate function, a data set must be acquired (INITiate, ARM, TRIGger), and the data may be transferred to the host (register access) before the execution CALC query. This sequence is not a prerequisite for sending a CALCulate query, but is required for valid data to be returned.

Examples Command / Query Response (Description)

Related Commands

CALC:NDUT?

CONFigure:NDUTy MEASure:NDUTy

(Returns the negative duty cycle measurement.)

VM2601/2/3 Command Dictionary 57

CALCulate:NWIDth?

o

g

VXI Technology, Inc.

Purpose

Type

Command Syntax

Command Parameters

*RST Value

Query Syntax

Query Parameters

Query Response

Description

Query that returns a negative pulse width measurement.

Query

None

N/A

CALCulate:PWIDth?

None

ASCII number representing a negative pulse width measurement in seconds.

The CALCulate:NWIDth query instructs the devuce to calculate and return a negative pulse width measurement. The negative pulse width is a measure of the time required to go from the 50% reference of the falling edge of one wave to the 50% reference of the rising edge on the next wave on a negative pulse.

1.0

0.8

0.6

e (V)

20

50% referenc e

4

Negative

Pulse Width

6 8 10 12 14 16 18

time ( s)µ

lta v

0.4

0.2

To correctly perform a CALCulate function, a data set must be acquired (INITiate, ARM, TRIGger), and the data may be transferred to the host (register access) before the execution CALC query. This sequence is not a prerequisite for sending a CALCulate query, but is required for valid data to be returned.

Examples Command / Query Response (Description)

CALC:PWID?

(Returns the positive pulse width measurement.)

Related Commands

CONFigure:NWIDth MEASure:NWIDth

20

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CALCulate:PDUTy?

Purpose

Type

Command Syntax

Command Parameters

*RST Value

Query Syntax

Query Parameters

Query Response

Description

Query that instructs the device to calculate and return the positive duty cycle.

Query

None

N/A

CALCulate:PDUTy?

None

ASCII number representing positive duty cycle measurement as a percentage.

The CALCulate:PDUTy query instructs the device to calculate and return the positive duty cycle of the digitized data. The positive duty cycle is defined as the positive pulse width divided by the period and is expressed as a percentage.

To correctly perform a CALCulate function, a data set must be acquired (INITiate, ARM, TRIGger), and the data may be transferred to the host (register access) before the execution CALC query. This sequence is not a prerequisite for sending a CALCulate query, but is required for valid data to be returned.

Examples Command / Query Response (Description)

Related Commands

CALC:PDUT?

CONFigure:PDUTy MEASure:PDUTy

(Returns the positive duty cycle measurement.)

VM2601/2/3 Command Dictionary 59

CALCulate:PERCent:NOVershoot?

VXI Technology, Inc.

Purpose

Type

Command Syntax

Command Parameters

*RST Value

Query Syntax

Query Parameters

Query Response

Description

Returns the negative overshoot as a percent of the signal amplitude.

Query

None

N/A

CALCulate: PERCent:NOVershoot?

None

ASCII value representing a voltage measurement.

The CALCulate:PERCent:NOVershoot query instructs the device to calculate and return the value corresponding to the negative overshoot as a percentage of the signal amplitude from the selected input range. The negative overshoot is defined as the amount of voltage by which a post-transitional aberration negatively exceeds a state boundary.

1.0

0.8

0.6 Amplitude

voltage (V)

0.4

0.2

0

2

6 8 10 12 14 16 18

4

time ( s)µ

Negative Overshoot

To correctly perform a CALCulate function, a data set must be acquired (INITiate, ARM, TRIGger), and the data may be transferred to the host (register access) before the execution CALC query. This sequence is not a prerequisite for sending a CALCulate query, but is required for valid data to be returned.

Examples Command / Query Response (Description)

CALC:PERC:NOV?

(Returns the negative overshoot voltage as a percentage of the signal amplitude.)

Related Commands

CONFigure:PERC:NOV MEASure:PERC:NOV

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CALCulate:PERCent:NPReshoot?

Purpose

Type

Command Syntax

Command Parameters

*RST Value

Query Syntax

Query Parameters

Query Response

Description

Returns the negative preshoot value for the acquired data as a percent of the signal amplitude.

Query

None

N/A

CALCulate:PERCent:NPReshoot?

None

ASCII value representing a voltage measurement in volts.

The CALCulate:PERCent:NPReshoot query instructs the device to calculate and return a voltage value corresponding to the negative preshoot from the selected input range. The negative preshoot is defined as the amount of voltage by which a pre-transitional aberration negatively exceeds a state boundary.

1.0

0.8

0.6

Negative Preshoot

voltage (V)

0.4

0.2

0

2

6 8 10 12 14 16 18

4

time ( s)µ

Amplitude

To correctly perform a CALCulate function, a data set must be acquired (INITiate, ARM, TRIGger), and the data may be transferred to the host (register access) before the execution CALC query. This sequence is not a prerequisite for sending a CALCulate query, but is required for valid data to be returned.

Examples Command / Query Response (Description)

CALC:PERC:NPR?

(Returns the negative pershoot value as a percent of the signal amplitude.)

Related Commands

CONFigure:PERC:NPR MEASure:PERC:NPR

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VM2601/2/3 Command Dictionary 61

CALCulate:PERCent:NRINging?

VXI Technology, Inc.

Purpose

Type

Command Syntax

Command Parameters

*RST Value

Query Syntax

Query Parameters

Query Response

Description

Returns the negative ringing as a percent of the signal amplitude.

Query

None

N/A

CALCulate:PERCent:NRINging?

None

ASCII value representing a voltage measurement.

The CALCulate:PERCent:NRINGing query instructs the device to calculate and return a value corresponding to the negative ringing of an signal on the selected input range as a percent of the signal amplitude. Negative ringing is defined as the peak-to-peak voltage of a negative post-transitional aberration.

1.0

0.8

0.6

voltage (V)

0.4

0.2

0

Negative Ringing

2

6 8 10 12 14 16 18

4

time ( s)µ

Amplitude

To correctly perform a CALCulate function, a data set must be acquired (INITiate, ARM, TRIGger), and the data may be transferred to the host (register access) before the execution CALC query. This sequence is not a prerequisite for sending a CALCulate query, but is required for valid data to be returned.

Examples Command / Query Response (Description)

CALC:PERC:NRIN?

(Returns the negative ringing value as a percent of the signal amplitude.)

Related Commands

CONFigure:PERC:NRIN MEASure:PERC:NRIN

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CALCulate:PERCent:POVershoot?

Purpose

Type

Command Syntax

Command Parameters

*RST Value

Query Syntax

Query Parameters

Query Response

Description

Returns the positive overshoot value for the acquired data as a percent of the signal amplitude.

Query

None

N/A

CALCulate:PERCent:POVershoot?

None

ASCII value representing a voltage measurement in volts.

The CALCulate:PERCent:POVershoot query instructs the device to calculate and return a voltage value corresponding to the positive overshoot from the selected input range as a percent of the signal amplitude. The positive overshoot is defined as the amount of voltage by which a post-transitional aberration positively exceeds the state boundary.

1.0

Positive Overshoot

0.8

0.6

Amplitude

voltage (V)

0.4

0.2

0

2

6 8 10 12 14 16 18

4

time ( s)µ

To correctly perform a CALCulate function, a data set must be acquired (INITiate, ARM, TRIGger), and the data may be transferred to the host (register access) before the execution CALC query. This sequence is not a prerequisite for sending a CALCulate query, but is required for valid data to be returned.

Examples Command / Query Response (Description)

CALC:PERC:POV?

(Returns the positive overshoot as a percent of the signal amplitude.)

Related Commands

CONFigure:PERC:POV MEASure:PERC:POV

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VM2601/2/3 Command Dictionary 63

CALCulate:PERCent:PPReshoot?

VXI Technology, Inc.

Purpose

Type

Command Syntax

Command Parameters

*RST Value

Query Syntax

Query Parameters

Query Response

Description

Returns the positive preshoot value for the aquried data as a percent of the signal amplitude.

Query

None

N/A

CALCulate:PERCent:PPReshoot?

None

ASCII value representing a voltage measurement in volts.

The CALCulate:PERCent:PPReshoot query instructs the device to calculate and return a voltage value corresponding to the positive preshoot from the selected input range as a percent of the signal amplitude. The positive preshoot is defined as the amount of voltage by which a pre-transitional aberration positively exceeds the state boundary.

1.0

0.8

Positive Preshoot

0.6

Amplitude

voltage (V)

0.4

0.2

0

2

6 8 10 12 14 16 18

4

time ( s)µ

To correctly perform a CALCulate function, a data set must be acquired (INITiate, ARM, TRIGger), and the data may be transferred to the host (register access) before the execution CALC query. This sequence is not a prerequisite for sending a CALCulate query, but is required for valid data to be returned.

Examples Command / Query Response (Description)

CALC:PERC:PPR?

(Returns the positive preshoot measurement as a percent of the signal amplitude.)

Related Commands

CONFigure:PERC:PPR MEASure:PERC:PPR

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CALCulate:PERCent:PRINging?

Purpose

Type

Command Syntax

Command Parameters

*RST Value

Query Syntax

Query Parameters

Query Response

Description

Returns the positive ringing as a percent of the signal amplitude.

Query

None

N/A

CALCulate:PERCent:PRINging?

None

ASCII value representing a voltage measurement in volts.

The CALCulate:PERCent:PRINGing query instructs the device to calculate and return a value corresponding to the negative ringing of an signal on the selected input range as a percent of the signal amplitude. The CALCulate:VOLTage:PRINGing query instructs the device to calculate and return a value corresponding to the positive ringing of an signal on the selected input range. Positive ringing is defined as the peak-to-peak voltage of a positive post-transitional aberration.

1.0

Positive

0.8

Ringing

0.6

Amplitude

voltage (V)

0.4

0.2

0

2

6 8 10 12 14 16 18

4

time ( s)µ

To correctly perform a CALCulate function, a data set must be acquired (INITiate, ARM, TRIGger), and the data may be transferred to the host (register access) before the execution CALC query. This sequence is not a prerequisite for sending a CALCulate query, but is required for valid data to be returned.

Examples Command / Query Response (Description)

CALC:PERC:PRIN?

(Returns the positive ringing value as a percent of the signal amplitude.)

Related Commands

CONFigure:PERC:PRIN MEASure: PERC:PRIN

20

VM2601/2/3 Command Dictionary 65

CALCulate:PERiod?

VXI Technology, Inc.

Purpose

Type

Command Syntax

Command Parameters

*RST Value

Query Syntax

Query Parameters

Query Response

Description

Query that returns a period measurement from the device.

Query

None

N/A

CALCulate:PERiod?

None

ASCII number representing a period measurement in seconds.

Query that returns a period measurement from the device. The period (T) is defined as the amount of time required for the signal to generate one signal cycle. This is also defined as 1/frequency (or 1/f).

To correctly perform a CALCulate function, a data set must be acquired (INITiate, ARM, TRIGger), and the data may be transferred to the host (register access) before the execution CALC query. This sequence is not a prerequisite for sending a CALCulate query, but is required for valid data to be returned.

Examples Command / Query Response (Description)

Related Commands

CALC:PER?

CONFigure:PERiod MEASure:PERiod

(Returns the period measurement.)

66 VM2601/2/3 Command Dictionary

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CALCulate:PWIDth?

Purpose

Type

Command Syntax

Command Parameters

*RST Value

Query Syntax

Query Parameters

Query Response

Description

Query that returns a positive pulse width measurement.

Query

None

N/A

CALCulate:PWIDth?

None

ASCII number representing a positive pulse width measurement in seconds.

The CALCulate:PWIDth query returns a positive pulse width measurement. The positive pulse width is a measure of the time required to go from the 50% reference of the rising edge of one wave to the 50% reference of the next falling edge.

1.0

0.8

0.6

e (V) lta

v

0.4

0.2

50% referenc e

Positive

Pulse Width

20

6 8 10 12 14 16 18

4

time ( s)µ

20

To correctly perform a CALCulate function, a data set must be acquired (INITiate, ARM, TRIGger), and the data may be transferred to the host (register access) before the execution CALC query. This sequence is not a prerequisite for sending a CALCulate query, but is required for valid data to be returned.

Examples Command / Query Response (Description)

CALC:PWID?

(Returns the positive pulse width measurement.)

Related Commands

CONFigure:FREQuency MEASure:PWIDth

VM2601/2/3 Command Dictionary 67

CALCulate:RISE:TIMe?

olta

g

)

VXI Technology, Inc.

Purpose

Type

Command Syntax

Command Parameters

*RST Value

Query Syntax

Query Parameters

Query Response

Description

Query that returns a rise-time measurement.

Query

None

N/A

CALCulate:RISE:TIMe? or CALCulate:RTIMe?

None

ASCII number representing a rise time measurement in seconds.

The CALCulate:RISE:TIME query instructs the instrument to calculate and return the amount of time it takes a signal to make a positive transition from the low reference to the high reference. The high reference defaults to 90% of the signal amplitude, and the low reference defaults to 10% of the signal amplitude.

1.0

90% referenc e

0.8

0.6

e (V

v

0.4

0.2

10% ref erence

20

Rise

Time

6 8 10 12 14 16 18

4

time ( s)µ

To correctly perform a CALCulate function, a data set must be acquired (INITiate, ARM, TRIGger), and the data may be transferred to the host (register access) before the execution CALC query. This sequence is not a prerequisite for sending a CALCulate query, but is required for valid data to be returned.

Examples Command / Query Response (Description)

Related Commands

CALC:RISE:TIM?

CONFigure:RISE:TIMe

(Returns the rise time measurement.)

MEASure:RISE:TIMe

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CALCulate:VOLTage:AMPLitude?

Purpose

Type

Command Syntax

Command Parameters

*RST Value

Query Syntax

Query Parameters

Query Response

Description

Returns the amplitude measurement for the data being acquired.

Query

None

N/A

CALCulate:VOLTage:AMPLitude?

None

ASCII value representing a voltage amplitude measurement in volts.

The CALCulate:VOLTage:AMPlitude query instructs the device to calculate and return an amplitude measurement for the data being acquired. Amplitude is defined as the voltage difference between the high and low states.

1.0

0.8

0.6

e (V) lta

v

0.4

Amplitude

0.2

20

6 8 10 12 14 16 18

4

time ( s)µ

To correctly perform a CALCulate function, a data set must be acquired (INITiate, ARM, TRIGger), and the data may be transferred to the host (register access) before the execution CALC query. This sequence is not a prerequisite for sending a CALCulate query, but is required for valid data to be returned.

Examples Command / Query Response (Description)

Related Commands

CALC:VOLT:AMPL?

CONFigure:VOLTage:AMPLitude

(Returns the voltage amplitude measurement.)

MEASure: VOLTage:AMPLitude

20

VM2601/2/3 Command Dictionary 69

CALCulate:VOLTage:HIGH?

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VXI Technology, Inc.

Purpose

Type

Command Syntax

Command Parameters

*RST Value

Query Syntax

Query Parameters

Query Response

Description

Returns the high voltage value for the acquired data.

Query

None

N/A

CALCulate:VOLTage:HIGH?

None

ASCII value representing a voltage measurement in volts.

The CALCulate:VOLTage:HIGH query instructs the device to calculate and return a voltage value from the data representing the high state.

1.0

0.8

0.6

e (V) lta

v

0.4

High

0.2

20

6 8 10 12 14 16 18

4

time ( s)µ

To correctly perform a CALCulate function, a data set must be acquired (INITiate, ARM, TRIGger), and the data may be transferred to the host (register access) before the execution CALC query. This sequence is not a prerequisite for sending a CALCulate query, but is required for valid data to be returned.

Examples Command / Query Response (Description)

Related Commands

CALC:VOLT:HIGH?

CONFigure:VOLTage:HIGH

(Returns the high input voltage value.)

MEASure:VOLTage:HIGH

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CALCulate:VOLTage:LOW?

Purpose

Type

Command Syntax

Command Parameters

*RST Value

Query Syntax

Query Parameters

Query Response

Description

Returns the low voltage value for the acquired data.

Query

None

N/A

CALCulate:VOLTage:LOW?

None

ASCII value representing a voltage measurement in volts.

The CALCulate:VOLTage:LOW query instructs the device to calculate and return a voltage value from the data representing the low state.

1.0

0.8

0.6

e (V) lta

v

0.4

Low

0.2

20

6 8 10 12 14 16 18

4

time ( s)µ

To correctly perform a CALCulate function, a data set must be acquired (INITiate, ARM, TRIGger), and the data may be transferred to the host (register access) before the execution CALC query. This sequence is not a prerequisite for sending a CALCulate query, but is required for valid data to be returned.

Examples Command / Query Response (Description)

Related Commands

CALC:VOLT:LOW?

CONFigure:VOLTage:LOW

(Returns the low input voltage value.)

MEASure: VOLTage:LOW

20

VM2601/2/3 Command Dictionary 71

CALCulate:VOLTage:MAXimum?

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VXI Technology, Inc.

Purpose

Type

Command Syntax

Command Parameters

*RST Value

Query Syntax

Query Parameters

Query Response

Description

Returns the maximum voltage value for the acquired data.

Query

None

N/A

CALCulate:VOLTage:MAXimum?

None

ASCII value representing a voltage measurement in volts.

The CALCulate:VOLTage:MAXimum query instructs the device to calculate and return a maximum voltage value from the acquired data set.

1.0

0.8

0.6

e (V) lta

v

0.4

Maximum

0.2

20

6 8 10 12 14 16 18

4

time ( s)µ

To correctly perform a CALCulate function, a data set must be acquired (INITiate, ARM, TRIGger), and the data may be transferred to the host (register access) before the execution CALC query. This sequence is not a prerequisite for sending a CALCulate query, but is required for valid data to be returned.

Examples Command / Query Response (Description)

Related Commands

CALC:VOLT:MAX?

CONFigure:VOLTage:MAXimum MEASure: VOLTage:MAXimum

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CALCulate:VOLTage:MEAN?

Purpose

Type

Command Syntax

Command Parameters

*RST Value

Query Syntax

Query Parameters

Query Response

Description

Returns the mean voltage value for the acquired data.

Query

None

N/A

CALCulate:VOLTage:MEAN?

None

ASCII value representing a voltage measurement in volts.

The CALCulate:VOLTage:MEAN query instructs the device to calculate and return the mean (average) voltage value from the acquired data set.

To correctly perform a CALCulate function, a data set must be acquired (INITiate, ARM, TRIGger), and the data may be transferred to the host (register access) before the execution CALC query. This sequence is not a prerequisite for sending a CALCulate query, but is required for valid data to be returned.

Examples Command / Query Response (Description)

Related Commands

CALC:VOLT:MEAN?

CONFigure:VOLTage:MEAN MEASure: VOLTage:MEAN

VM2601/2/3 Command Dictionary 73

CALCulate:VOLTage:MINimum?

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VXI Technology, Inc.

Purpose

Type

Command Syntax

Command Parameters

*RST Value

Query Syntax

Query Parameters

Query Response

Description

Returns the minimum voltage value for the acquired data.

Query

None

N/A

CALCulate:VOLTage:MINimum?

None

ASCII value representing a voltage measurement in volts.

The CALCulate:VOLTage:MINimum query instructs the device to calculate and return a minimum voltage value from the acquired data set.

1.0

0.8

0.6

e (V) lta

v

0.4

0.2 Minimum

20

6 8 10 12 14 16 18

4

time ( s)µ

To correctly perform a CALCulate function, a data set must be acquired (INITiate, ARM, TRIGger), and the data may be transferred to the host (register access) before the execution CALC query. This sequence is not a prerequisite for sending a CALCulate query, but is required for valid data to be returned.

Examples Command / Query Response (Description)

Related Commands

CALC:VOLT:MIN?

CONFigure:VOLTage:MINimum MEASure: VOLTage:MINimum

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CALCulate:VOLTage:NOVershoot?

Purpose

Type

Command Syntax

Command Parameters

*RST Value

Query Syntax

Query Parameters

Query Response

Description

Returns the negative overshoot value for the acquired data.

Query

None

N/A

CALCulate:VOLTage:NOVershoot?

None

ASCII value representing a voltage measurement in volts.

The CALCulate:VOLTage:NOVershoot query instructs the device to calculate and return the voltage value corresponding to the negative overshoot from the selected input range. The negative overshoot is defined as the amount of voltage by which a posttransitional aberration negatively exceeds a state boundary.

1.0

0.8

0.6

voltage (V)

0.4

0.2

0

2

6 8 10 12 14 16 18

4

time ( s)µ

Negative Overshoot

To correctly perform a CALCulate function, a data set must be acquired (INITiate, ARM, TRIGger), and the data may be transferred to the host (register access) before the execution CALC query. This sequence is not a prerequisite for sending a CALCulate query, but is required for valid data to be returned.

Examples Command / Query Response (Description)

Related Commands

CALC:VOLT:NOV?

CONFigure:VOLTage:NOVershoot

(Returns the voltage of the negative overshoot.)

MEASure: VOLTage:NOVershoot

20

VM2601/2/3 Command Dictionary 75

CALCulate:VOLTage:NPReshoot?

VXI Technology, Inc.

Purpose

Type

Command Syntax

Command Parameters

*RST Value

Query Syntax

Query Parameters

Query Response

Description

Returns the negative preshoot value for the acquired data.

Query

None

N/A

CALCulate:VOLTage:NPReshoot?

None

ASCII value representing a voltage measurement in volts.

The CALCulate:VOLTage:NPReshoot query instructs the device to calculate and return a voltage value corresponding to the negative preshoot from the selected input range. The negative preshoot is defined as the amount of voltage by which a pre-transitional aberration negatively exceeds a state boundary.

1.0

0.8

0.6 Negative Preshoot

voltage (V)

0.4

0.2

0

2

6 8 10 12 14 16 18

4

time ( s)µ

To correctly perform a CALCulate function, a data set must be acquired (INITiate, ARM, TRIGger), and the data may be transferred to the host (register access) before the execution CALC query. This sequence is not a prerequisite for sending a CALCulate query, but is required for valid data to be returned.

Examples Command / Query Response (Description)

Related Commands

CALC:VOLT:NPR?

CONFigure:VOLTage:NPReshoot

(Returns the negative preshoot voltage.)

MEASure: VOLTage:NPReshoot

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CALCulate:VOLTage:NRINging?

Purpose

Type

Command Syntax

Command Parameters

*RST Value

Query Syntax

Query Parameters

Query Response

Description

Returns the negative ringing measurement of the data being acquired.

Query

None

N/A

CALCulate:VOLTage:NRINging?

None

ASCII value representing a voltage measurement in volts.

The CALCulate:VOLTage:NRINGing query instructs the device to calculate and return a value corresponding to the negative ringing of an signal on the selected input range. Negative ringing is defined as the peak-to-peak voltage of a negative post-transitional aberration.

1.0

0.8

0.6

voltage (V)

0.4

0.2

0

Negative Ringing

2

6 8 10 12 14 16 18

4

time ( s)µ

To correctly perform a CALCulate function, a data set must be acquired (INITiate, ARM, TRIGger), and the data may be transferred to the host (register access) before the execution CALC query. This sequence is not a prerequisite for sending a CALCulate query, but is required for valid data to be returned.

Examples Command / Query Response (Description)

CALC:VOLT:NRIN?

(Returns the value of the negative ringing voltage.)

Related Commands

CONFigure:VOLTage:NRINging MEASure:VOLTage:NRINging

20

VM2601/2/3 Command Dictionary 77

CALCulate:VOLTage:POVershoot?

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VXI Technology, Inc.

Purpose

Type

Command Syntax

Command Parameters

*RST Value

Query Syntax

Query Parameters

Query Response

Description

Returns the positive overshoot value for the acquired data.

Query

None

N/A

CALCulate:VOLTage:POVershoot?

None

ASCII value representing a voltage measurement in volts.

The CALCulate:VOLTage:POVershoot query instructs the device to calculate and return a voltage value corresponding to the positive overshoot from the selected input range. The positive overshoot is defined as the amount of voltage by which a post-transitional aberration positively exceeds the state boundary.

1.0 Positive Overshoot

0.8

0.6

e (V) lta

v

0.4

0.2

20

6 8 10 12 14 16 18

4

time ( s)µ

To correctly perform a CALCulate function, a data set must be acquired (INITiate, ARM, TRIGger), and the data may be transferred to the host (register access) before the execution CALC query. This sequence is not a prerequisite for sending a CALCulate query, but is required for valid data to be returned.

Examples Command / Query Response (Description)

Related Commands

CALC:VOLT:POV?

CONFigure:VOLTage:POVershoot

(Returns the positive overshoot voltage.)

MEASure: VOLTage:POVershoot

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CALCulate:VOLTage:PPReshoot?

Purpose

Type

Command Syntax

Command Parameters

*RST Value

Query Syntax

Query Parameters

Query Response

Description

Returns the positive preshoot value for the aquried data.

Query

None

N/A

CALCulate:VOLTage:PPReshoot?

None

ASCII value representing a voltage measurement in volts.

The CALCulate:VOLTage:PPReshoot query instructs the device to calculate and return a voltage value corresponding to the positive preshoot from the selected input range. The positive preshoot is defined as the amount of voltage by which a pre-transitional aberration positively exceeds the state boundary.

1.0

0.8

Positive Preshoot

0.6

e (V) lta

v

0.4

0.2

20

6 8 10 12 14 16 18

4

time ( s)µ

To correctly perform a CALCulate function, a data set must be acquired (INITiate, ARM, TRIGger), and the data may be transferred to the host (register access) before the execution CALC query. This sequence is not a prerequisite for sending a CALCulate query, but is required for valid data to be returned.

Examples Command / Query Response (Description)

Related Commands

CALC:VOLT:PPR?

CONFigure:VOLTage:PPReshoot MEASure: VOLTage:PPReshoot

20

VM2601/2/3 Command Dictionary 79

CALCulate:VOLTage:PRINging?

VXI Technology, Inc.

Purpose

Type

Command Syntax

Command Parameters

*RST Value

Query Syntax

Query Parameters

Query Response

Description

Returns the positive ringing measurement of the data being acquired.

Query

None

N/A

CALCulate:VOLTage:PRINging?

None

ASCII value representing a voltage measurement in volts.

The CALCulate:VOLTage:PRINGing query instructs the device to calculate and return a value corresponding to the positive ringing of an signal on the selected input range. Positive ringing is defined as the peak-to-peak voltage of a positive post-transitional aberration.

1.0 Positive

0.8

Ringing

0.6

voltage (V)

0.4

0.2

0

2

6 8 10 12 14 16 18

4

time ( s)µ

To correctly perform a CALCulate function, a data set must be acquired (INITiate, ARM, TRIGger), and the data may be transferred to the host (register access) before the execution CALC query. This sequence is not a prerequisite for sending a CALCulate query, but is required for valid data to be returned.

Examples Command / Query Response (Description)

Related Commands

CALC:VOLT:PRIN?

CONFigure:VOLTage:PRINging

(Returns the positive ringing voltage.)

MEASure:VOLT:PRINging

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CALCulate:VOLTage:PTPeak?

Purpose

Type

Command Syntax

Command Parameters

*RST Value

Query Syntax

Query Parameters

Query Response

Description

Returns the peak-to-peak voltage value for the acquired data.

Query

None

N/A

CALCulate:VOLTage:PTPeak?

None

ASCII value representing a voltage measurement in volts.

The CALCulate:VOLTage:PTPeak query instructs the device to calculate and return a peak-to-peak voltage measurement from the selected input range. The peak-to-peak voltage (V

) is defined as the voltage measured between the signal’s maximum and

P-P

minimum points.

1.0

0.8

0.6

e (V) lta

v

0.4

0.2

20

6 8 10 12 14 16 18

4

time ( s)µ

Peak-to-Peak Voltage

To correctly perform a CALCulate function, a data set must be acquired (INITiate, ARM, TRIGger), and the data may be transferred to the host (register access) before the execution CALC query. This sequence is not a prerequisite for sending a CALCulate query, but is required for valid data to be returned.

Examples Command / Query Response (Description)

Related Commands

CALC:VOLT:PTP?

CONFigure:VOLTage:PTPeak MEASure: VOLTage:PTPeak

20

VM2601/2/3 Command Dictionary 81

CALCulate:VOLTage:RMS?

VXI Technology, Inc.

Purpose

Type

Command Syntax

Command Parameters

*RST Value

Query Syntax

Query Parameters

Query Response

Description

Returns the root-mean-square (rms) voltage value of the data being acquired.

Query

None

N/A

CALCulate:VOLTage:RMS?

None

ASCII value representing a voltage measurement in volts.

The CALCulate:VOLTage:RMS query instructs the device to calculate and return the root-mean-square (rms) voltage from the selected input range. The root-mean-square voltage is defined by the following formula:

n

−=1

2

v

∑

V

rms

0

, where v = voltage and n = number of samples

n

To correctly perform a CALCulate function, a data set must be acquired (INITiate, ARM, TRIGger), and the data may be transferred to the host (register access) before the execution CALC query. This sequence is not a prerequisite for sending a CALCulate query, but is required for valid data to be returned.

Examples Command / Query Response (Description)

Related Commands

CALC:VOLT:RMS?

CONFigure:VOLTage:RMS MEASure: VOLTage:RMS

82 VM2601/2/3 Command Dictionary

www.vxitech.com

(

CALibration:ADC:GAIN

Purpose

Type

Command Syntax

Command Parameters

*RST Value

Query Syntax

Query Parameters

Query Response

Description

To provide an ADC gain factor for measurement compensation.

Command

CALibration:ADC:GAIN <adc_type>, <adc_gain>

<adc_type> = FAST or SLOW <adc_gain> = for FAST, 1.15 – 1.35; for SLOW: 1.12 – 1.32

<adc_gain> = 1.0000

CALibration:ADC:GAIN <adc_type>

<adc_type> = FAST or SLOW

Returns the value currently set for the <adc_gain> parameter for the given <adc_type>.

Sets the gain factor for the indicated ADC. CALibration:ADC:GAIN compensates for gain errors due to component tolerances. This factor is calculated using the following formula:

voltscal

FactorGain

=

2

This command is ‘context sensitive’, i.e. it sets the ADC gain factor for the specified ADC in the currently selected input range.

On the VM2601, if the IFR input is selected, the only valid value for the <adc_type> parameter is FAST and only one range (±0.5 V) is applicable for the FAST ADC. Note that the IFR input is not installed on the VM2602 and VM2603.

The valid entries for the <adc_type> parameter are: FAST SLOW

×

()()

)

383,16_

−××

offsetsamplerange

Calibration commands should only be executed by qualified personnel. Changing these values incorrectly can cause the instrument to perform improperly.

Examples Command / Query Response (Description)

Related Commands

VM2601/2/3 Command Dictionary 83

CAL:ADC:GAIN 2,1.25

CALibration:ADC:OFFSet

()(

−

=

(

VXI Technology, Inc.

Purpose

Type

Command Syntax

Command Parameters

*RST Value

Query Syntax

Query Parameters

Query Response

Description

To provide an ADC offset value for measurement compensation.

Command

CALibration:ADC:OFFSet <adc_type>, <adc_offset>

<adc_type> = FAST or SLOW <adc_offset> = 8092 – 8292

<adc_offset> = 8192

CALibration:ADC:OFFSet? <adc_type>

<adc_type> = FAST, SLOW

Returns the value currently set for the <adc_offset> parameter for the given <adc_offset>.

Sets the offset value for the indicated ADC. The offset value compensates for offsets in the signal path and converting the raw data from straight binary to signed (twos complement) binary. The offset value is calibrated by applying 0 V to the input and determining the offset required for the measurement to read 0 V:

)( )

gaincountvoltsoffsetsamplevoltsvalueOffset /)(

where

This command is ‘context sensitive’, i.e. it sets the ADC offset factor for the specified ADC in the currently selected input range.

On the VM2601, if the IFR input is selected, the only valid value for the <adc_type> parameter is FAST and only one range (±0.5 V) is applicable for the FAST ADC. Note that the IFR input is not installed on the VM2602 and VM2603.

The valid entries for the <adc_type> parameter are: FAST SLOW

/

countvolts =

2

)

rangevoltage

383,16

Calibration commands should only be executed by qualified personnel. Changing these values incorrectly can cause the instrument to perform improperly.

Examples Command / Query Response (Description)

Related Commands

84 VM2601/2/3 Command Dictionary

CAL:ADC:OFFS 8207

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CALibration:COUNt?

Purpose

Type

Command Syntax

Command Parameters

*RST Value

Query Syntax

Query Parameters

Query Response

Description

Tracks the number of times calibration memory has been written.

Query

None

N/A

CALibration:COUNt?

None

Returns a numeric value from 0 to 16,777,215 (after the maximum value, it will wrap to

0)

The CALibration:COUNt query returns the number of times the CALibration:STORe operation has been performed. This provides some indication of EEPROM wear.

Calibration commands should only be executed by qualified personnel. Changing these values incorrectly can cause the instrument to perform improperly.

Examples Command / Query Response (Description)

Related Commands

CAL:COUN?

24 (Returns the number of times the CAL:STOR command has been performed.)

VM2601/2/3 Command Dictionary 85

CALibration:DAC:GAIN

VXI Technology, Inc.

Purpose

Type

Command Syntax

Command Parameters

*RST Value

Query Syntax

Query Parameters

Query Response

Description

To set the calibration factor that compensates for DAC gain inaccuracies.

Command

CALibration:DAC:GAIN <dac_chan>, <dac_gain>

<dac_chan> = 0 – 5 <dac_gain> = range depends on channel

<dac_gain> = 1.000 (or Cal Value)

CALibration:DAC:GAIN? <dac_chan>

<dac_chan> = 0 – 5

Returns the value currently set for the <dac_gain> parameter for the given <dac_chan>.

Sets the gain factor for the indicated DAC. CALibration:DAC:GAIN compensates for deviations from the ideal slope for the DAC. Prior to calibration, the <dac_gain> parameter will read “1” after a reset condition. After calibration has been performed, this value changes and is stored in non-volatile memory. When a reset condition occurs after calibration, the value stored in non-volatile memory is returned.

Calibration commands should only be executed by qualified personnel. Changing these values incorrectly can cause the instrument to perform improperly.

Examples Command / Query Response (Description)

Related Commands

CAL:DAC:GAIN 2,.98

86 VM2601/2/3 Command Dictionary

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CALibration:DAC:OFFSet

Purpose

Type

Command Syntax

Command Parameters

*RST Value

Query Syntax

Query Parameters

Query Response

Description

To set the calibration factor that compensates for DAC offset inaccuracies

Command

CALibration:DAC:OFFSet <dac_chan>, <dac_offset>

<dac_chan> = 0 - 5 <dac_offset> = approximately 1947 - 2147

<dac_offs> = 2047 (or Cal Value)

CALibration:DAC:OFFSet <dac_chan>

<dac_chan> = 0 - 5

Returns the value currently set for the <dac_offset> parameter for the given <dac_chan>.

Sets the offset value for the indicated DAC. The offset value compensates for conversion of data from sine binary to straight binary. Prior to calibration, the <dac_offs> parameter will read “2047” after a reset condition. After calibration has been performed, this value changes and is stored in non-volatile memory. When a reset condition occurs after calibration, the value stored in non-volatile memory is returned.

Calibration commands should only be executed by qualified personnel. Changing these values incorrectly can cause the instrument to perform improperly.

Examples Command / Query Response (Description)

Related Commands

CAL:DAC:OFFS 2,1900

VM2601/2/3 Command Dictionary 87

CALibration:DEFault

VXI Technology, Inc.

Purpose

Type

Command Syntax

Command Parameters

*RST Value

Query Syntax

Query Parameters

Query Response

Description

Sets all calibration factors to their default values.

Command

CALibration:DEFault

None

N/A

Sets all calibration factors to their default values. The values assumed are as follows:

<adc_gain>: 1.000 <adc_offset>: 8192 <dac_gain>: 1.000 <dac_offset>: 2047

Calibration commands should only be executed by qualified personnel. Changing these values incorrectly can cause the instrument to perform improperly.

Examples Command / Query Response (Description)

Related Commands

CAL:DEF

(Resets the ADC and DAC gain and offset settings to thei default/*RST values.)

88 VM2601/2/3 Command Dictionary

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CALibration:RESet

Purpose

Type

Command Syntax

Command Parameters

*RST Value

Query Syntax

Query Parameters

Query Response

Description

Resets all calibration factors to the values stored in the non-volatile memory (EEPROM).

Command

CALibration:RESet

None

N/A

None

N/A

Resets all calibration factors to the values stored in the non-volatile memory (EEPROM).

Calibration commands should only be executed by qualified personnel. Changing these values incorrectly can cause the instrument to perform improperly.

Examples Command / Query Response (Description)

Related Commands

CAL:RES

CALibration:DEFault:GAIN CALibration:DEFault:OFFSet CALibration:SECure

(Resets all calibration factors to the values stored in non-volatile memory.)

VM2601/2/3 Command Dictionary 89

CALibration:SECure:CODE

1

2#3

VXI Technology, Inc.

Purpose

Type

Command Syntax

Command Parameters

*RST Value

Query Syntax

Query Parameters

Query Response

Description

Sets the code required to disable calibration security.

Instrument specific command

CALibration:SECure:CODE <string>

<string> = the code string can be from 1 to 15 ASCII characters in length entered in IEEE 488.2 definite or indefinite length arbitrary block format.

None

CALibration:SECure:CODE?

None

Returns the security code in IEEE 488.2 definite block format.

The calibration security code command sets the code required to disable calibration security. Calibration security must first be disabled before the code can be changed.

Definite length arbitrary block format is used to define the <string> parameter. This format contains, essentially, four parts:

#206VM260

#1#

#1: a pound sign header. #2: indicates how many digits are used in #3. #3: indicates the number of characters that are used in #4 (the security code). Valid numbers for the third section are 1 through 15. #4: the security code. It may be up to 15 characters long and is case sensitive.

Before shipping the instrument, the default security code is the module’s model number (i.e. VM2601, VM2602, or VM2603).

#4

Calibration commands should only be executed by qualified personnel. Changing these values incorrectly can cause the instrument to perform improperly.

Examples Command / Query Response (Description)

Related Commands

90 VM2601/2/3 Command Dictionary

CAL:SEC:CODE #206VM2601

CALibration:SECure:STATe CALibration:STORe

(Sets the factory code setting of VM2601)

www.vxitech.com

CALibration:SECure[:STATe]

Purpose

Type

Command Syntax

Command Parameters

*RST Value

Query Syntax

Query Parameters

Query Response

Description

Enable or disable calibration security.

Command

CALibration:SECure[:STATe] <boolean> or CALibration:SECure[:STATe] <boolean>, <string>

<boolean> = 0 | 1 | OFF | ON <string> = the code string can be from 1 to 15 ASCII characters in length entered in IEEE 488.2 definite or indefinite length arbitrary block format.

<boolean> = ON

CALibration:SECure[:STATe]?

None

Returns the value currently selected for the <boolean> parameter

The CALibration:SECurity[:STATe] command enables or disables calibration security. While security is on, the calibration factors ADC gain, ADC offset, DAC gain and DAC offset cannot be changed. In addition, the CAL:STORe command is disabled, effectively write protecting the non-volatile memory. In order to disable the security state, the security code must be supplied. The factory default security code is VM2601 (see CALibration:SECure:CODE for more information). To enable security, the code does not need to be supplied. The security state is enabled by default.

Security can also be enabled without entering the <string> parameter by sending the CALibration:SECure[:STATe] 1 | ON command. Security cannot, however, be disabled using a CALibration:SECure[:STATe] 0 | OFF command. If this command is sent, a “Missing Parameter” error will be returned.

Calibration commands should only be executed by qualified personnel. Changing these values incorrectly can cause the instrument to perform improperly.

Examples Command / Query Response (Description)

Related Commands

VM2601/2/3 Command Dictionary 91

CAL:SEC:STAT OFF,#206VM2601 CAL:SEC:STAT 1 CAL:SEC:STAT?

CALibration:STORe

(Disables calibration security.)

(Enables calibration security.)

1 (Indicates that calibration security is enabled.)

CALibration:STORe

VXI Technology, Inc.

Purpose

Type

Command Syntax

Command Parameters

*RST Value

Query Syntax

Query Parameters

Query Response

Description

Stores calibration data into non-volatile memory.

Command

CALibration:STORe

None

N/A

None

N/A

The CALibration:STORe command stores correction data into non-volatile memory. The correction data is calibration data that has been downloaded via the program messages in the Calibration Data subsystem. The CALibration:STORe command should only be performed after all the correction data has been finalized.

Note: Security must be turned off in order to use this command.

Calibration commands should only be executed by qualified personnel. Changing these values incorrectly can cause the instrument to perform improperly.

Examples Command / Query Response (Description)

Related Commands

CAL:SEC OFF,#206VM2601 CAL:STOR CAL:SEC 1

CALibration:COUNt CALibration:SECure:CODE CALibration:SECure:STATe

(Disables calibration security.)

(Stores correction data into non-volatile memory.)

(Enables calibration security.)

92 VM2601/2/3 Command Dictionary

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COMBine:FEED

Purpose

Type

Command Syntax

Command Parameters

*RST Value

Query Syntax

Query Parameters

Query Response

Description

Sets a marker for specified events allowing for easy reference after acquisition is complete.

Command

COMBine:FEED <mark_source_1>, <mark_source_2>

<mark_source_1> = GND | GP0 | GP1 | OVR <mark_source_2> = GND | GP0 | GP1 | OVR

<mark_source_1> & <mark_source_2> = GND

COMBine:FEED? <mark>

<mark> = 1 | 2

Returns the value currently selected for the <mark_source> for the indicated <mark>

Feeds <mark_source_1> to D14 and <mark_source_2> to D15 with each sample taken during data acquisition. The markers are retrieved with the raw data.

Examples Command / Query Response (Description)

Related Commands

COMB:FEED GP0,GP1

None

VM2601/2/3 Command Dictionary 93

CONFigure?

VXI Technology, Inc.

Purpose

Type

Command Syntax

Command Parameters

*RST Value

Query Syntax

Query Parameters

Query Response

Description

Outputs the currently configured measurement.

Query

None

N/A

PERiod

CONFigure?

None

Outputs the currently configured measurement.

Outputs the currently configured measurement. No configuration information is returned with this query. PERiod is the default setting.

Examples Command / Query Response (Description)

Related Commands

MEAS:VOLT:RTIM? 0,1024,10,90,5.0

CONF?

None

(Takes a rise time measurement between the 10 and 90 percent reference levels)

RTIM? (Returns the currently configured measurement.)

94 VM2601/2/3 Command Dictionary

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CONFigure:ADC

Purpose

Type

Command Syntax

Command Parameters

*RST Value

Query Syntax

Query Parameters

Query Response

Description

Examples Command / Query Response (Description)

Related Commands

Selects between the fast and slow ADCs.

Command

CONFigure:ADC <conf_adc>

<conf_adc> = FAST | SLOW | AUTO

FAST

CONFigure:ADC?

None

Returns the value currently selected for the <conf_adc> parameter

This command selects between the two converters. The fast ADC converts at up to 80 MSa/s for the VM2601, 40 MSa/s for the VM2602, and 20 MSa/s for the VM2603. The slow ADC converts at up to 10 MSa/s for all three modules. The slow converter provides improved dc accuracy for low-frequency measurements.

When AUTO is selected, the module selects the best converter to be used based upon the sample rate, with the slow converter being used if possible. The following criteria is used to determine which ADC is selected:

If the sample rate is between 4.7 Hz and 1 kHz, then the FAST ADC is selected. If the sample rate is between 1 kHz and 10 MHz, then the SLOW ADC is selected. If the sample rate is between 10 MHz and the maximum ADC rate, then the FAST ADC is selected.

This command only applies to the DSO. The IFR input will always utilize the FAST ADC (VM2601 only).

CONF:ADC SLOW CONF:ADC?

None

(Selects the slow ADC)

SLOW (Indicates that the slow ADC is selected)

VM2601/2/3 Command Dictionary 95

CONFigure:FALL:TIMe

VXI Technology, Inc.

Purpose

Type

Command Syntax

Command Parameters

Reset Value

Query Syntax

Query Parameters

Query Response

Description

Examples Command / Query Response (Description)

Related Commands

Defines the fall time parameters that will govern corresponding CALCulate and MEASure commands.

Command

CONFigure:FALL:TIMe <start_samp>, <#_samp>, <lo_ref>, <hi_ref>, <expected_val> or CONFigure:FTIMe <start_samp>, <#_samp>, <lo_ref>, <hi_ref>, <expected_val>

<start_samp> = typically 0 <#_samp> = 8 – 16,777,216 <lo_ref> = 0 to 100 (percent). The default is 10% and it must be less than <hi_ref> <hi_ref> = 0 to 100 (percent). The default is 90% and it must be greater than <lo_ref> <expected_val> = depends on input

<start_samp> = 0 <#_samp> = 1,024 <lo_ref> = 10 (percent) <hi_ref> = 90 (percent)

None

N/A

This command defines the parameters used by the CALCulate:FTIMe query. Fall time is defined as the time interval that occurs between the 90% reference and 10% reference of the signal amplitude.

The parameters for this command are defined as follows:

• <start_samp> = indicates the number of the sample, with respect to the trigger point,

that will be the first sample used in the measurement. (0 = trigger point). If <start_samp> is negative, pre-trigger samples will be included in the measurement.

• <#_samp> = indicates the number of samples to be used in the measurement.

• <lo_ref> = fall time ends when a negative transition of the input signal crosses this

reference point.

• <hi_ref> = fall time begins when a negative transition of the input signal crosses this

reference point.

• <expected_val> = the value that is expected to be returned by the instruement.

CONF:FTIM 0,2048,10,90,x

CALCulate:FALL:TIME? CALCulate:FTIMe?

96 VM2601/2/3 Command Dictionary

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CONFigure:FREQuency

Purpose

Type

Command Syntax

Command Parameters

Default Value

Query Syntax

Query Parameters

Query Response

Description

Examples Command / Query Response (Description)

Related Commands

Defines the frequency parameters that will govern corresponding CALCulate and MEASure commands.

Command

CONFigure:FREQuency <start_samp>, <#_samples>, <expected_val>

<start_samp> = typically 0 <#_samp> = 8 to 16,777,216 <expected_val> = depends on input

<start_samp> = 0 <#_samp> = 1,024

None

N/A

This command defines the parameters used by the CALCulate:FREQuency query. Frequency (f) is a measure of how often a signal repeats in one second (1/s = Hz). This is also equal to 1/period (or 1/T).

The parameters for this command are defined as follows:

• <start_samp> = indicates the number of the sample, with respect to the trigger point,

that will be the first sample used in the measurement. (0 = trigger point). If <start_samp> is negative, pre-trigger samples will be included in the measurement.

• <#_samp> = indicates the number of samples to be used in the measurement.

• <expected_val> = the value that is expected to be returned by the instruement.

CONF:FREQ 0,65536,x

CALCulate:FREQuency?

VM2601/2/3 Command Dictionary 97

CONFigure:HORizontal:RESolution

VXI Technology, Inc.

Purpose

Type

Command Syntax

Command Parameters

Sets the sample period for the ADC.

Command

CONFigure:HORizontal:RESolution <hrz_reso>

<hrz_reso> = 12.5 ns/Sa – 209.7 ms/Sa (Fast ADC) 100 ns/Sa – 1 ms/Sa (Slow ADC)

*RST Value

Query Syntax

Query Parameters

Query Response

Description

100 ns/Sa for both the Fast and Slow ADC

CONFigure:HORizontal:RESolution?

None

Returns the value currently selected for the <hrz_reso> parameter.

Sets the sample period (period = 1/rate). The minimum and maximum sample times for each ADC type are defined below:

FAST ADC Minimum = 1 / SR

= 12.5 ns/sample for the VM2601

MAX

= 25 ns/sample for the VM2602 = 50 ns/sample for the VM2603 Maximum = 16,777,216 / SR

= 209.7 ms/sample

MAX

= 419.4 ms/sample = 838.8 ms/sample

Where SR

is the maximum sample rate for module being used.

MAX

SLOW ADC Minimum = 100 ns/sample (1 / 10 MHz) Maximum = 1 ms/sample (10,000 /10 MHz)

Examples Command / Query Response (Description)

CONF:HOR RES 25.0e-9 CONF:HOR:RES?

(Sets the sample rate to 25 ns/Sa)

2.500000000000000e-08

(Indicates that the sample rate for the ADC is 25 ns/Sa)

Related Commands

98 VM2601/2/3 Command Dictionary

VXI VM2601, VM2602 User Manual

Specifications and Main Features

Frequently Asked Questions

User Manual